245 lines
15 KiB
JSON
245 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-3125",
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"assignerOrgId": "a22f1246-ba21-4bb4-a601-ad51614c1513",
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"state": "PUBLISHED",
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"assignerShortName": "cloudflare",
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"dateReserved": "2026-02-24T14:15:54.385Z",
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"datePublished": "2026-03-04T18:14:31.111Z",
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"dateUpdated": "2026-03-04T18:58:56.614Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://www.npmjs.com/package/@opennextjs/cloudflare",
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"defaultStatus": "unaffected",
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"modules": [
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"packages/cloudflare/src/cli/templates/worker.ts"
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],
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"packageName": "@opennextjs/cloudflare",
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"platforms": [
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"Cloudflare Workers"
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],
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"product": "@opennextjs/cloudflare",
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"repo": "https://github.com/opennextjs/opennextjs-cloudflare",
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"vendor": "opennextjs",
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"versions": [
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{
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"lessThan": "1.17.1",
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"status": "affected",
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"version": "0",
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"versionType": "npm"
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}
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]
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "https://x.com/ez_z3r"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p><span style=\"background-color: transparent;\">A Server-Side Request Forgery (SSRF) vulnerability was identified in the @opennextjs/cloudflare package, resulting from a path normalization bypass in the /cdn-cgi/image/ handler.</span><span style=\"background-color: transparent;\">The @opennextjs/cloudflare worker template includes a /cdn-cgi/image/ handler intended for development use only. In production, Cloudflare's edge intercepts /cdn-cgi/image/ requests before they reach the Worker. However, by substituting a backslash for a forward slash (/cdn-cgi\\image/ instead of /cdn-cgi/image/), an attacker can bypass edge interception and have the request reach the Worker directly. The JavaScript URL class then normalizes the backslash to a forward slash, causing the request to match the handler and trigger an unvalidated fetch of arbitrary remote URLs.</span></p><p><span style=\"background-color: transparent;\">For example: </span></p><p><span style=\"background-color: transparent;\"><a target=\"_blank\" rel=\"nofollow\" href=\"https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com\">https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com</a></span></p><p><span style=\"background-color: transparent;\">In this example, attacker-controlled content from attacker.com is served through the victim site's domain (victim-site.com), violating the same-origin policy and potentially misleading users or other services.</span></p><p><span style=\"background-color: transparent;\">Note: This bypass only works via HTTP clients that preserve backslashes in paths (e.g., curl --path-as-is). Browsers normalize backslashes to forward slashes before sending requests.</span></p><span style=\"background-color: transparent;\">Additionally, Cloudflare Workers with Assets and Cloudflare Pages suffer from a similar vulnerability. Assets stored under /cdn-cgi/ paths are not publicly accessible under normal conditions. However, using the same backslash bypass (/cdn-cgi</span><span style=\"background-color: transparent;\">\\.</span><span style=\"background-color: transparent;\">.. instead of /cdn-cgi/...), these assets become publicly accessible. This could be used to retrieve private data. For example, Open Next projects store incremental cache data under /cdn-cgi/_next_cache, which could be exposed via this bypass.</span><br>"
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}
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],
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"value": "A Server-Side Request Forgery (SSRF) vulnerability was identified in the @opennextjs/cloudflare package, resulting from a path normalization bypass in the /cdn-cgi/image/ handler.The @opennextjs/cloudflare worker template includes a /cdn-cgi/image/ handler intended for development use only. In production, Cloudflare's edge intercepts /cdn-cgi/image/ requests before they reach the Worker. However, by substituting a backslash for a forward slash (/cdn-cgi\\image/ instead of /cdn-cgi/image/), an attacker can bypass edge interception and have the request reach the Worker directly. The JavaScript URL class then normalizes the backslash to a forward slash, causing the request to match the handler and trigger an unvalidated fetch of arbitrary remote URLs.\n\nFor example: \n\n https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com \n\nIn this example, attacker-controlled content from attacker.com is served through the victim site's domain (victim-site.com), violating the same-origin policy and potentially misleading users or other services.\n\nNote: This bypass only works via HTTP clients that preserve backslashes in paths (e.g., curl --path-as-is). Browsers normalize backslashes to forward slashes before sending requests.\n\nAdditionally, Cloudflare Workers with Assets and Cloudflare Pages suffer from a similar vulnerability. Assets stored under /cdn-cgi/ paths are not publicly accessible under normal conditions. However, using the same backslash bypass (/cdn-cgi\\... instead of /cdn-cgi/...), these assets become publicly accessible. This could be used to retrieve private data. For example, Open Next projects store incremental cache data under /cdn-cgi/_next_cache, which could be exposed via this bypass."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-664",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-664 Server Side Request Forgery"
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}
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]
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},
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{
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"capecId": "CAPEC-267",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-267 Leverage Alternate Encoding"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"attackVector": "NETWORK",
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"baseScore": 7.7,
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"baseSeverity": "HIGH",
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"exploitMaturity": "NOT_DEFINED",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "HIGH",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "NONE",
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"vulnConfidentialityImpact": "LOW",
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"vulnIntegrityImpact": "LOW",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-918",
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"description": "CWE-918 Server-Side Request Forgery (SSRF)",
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"lang": "en",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-706",
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"description": "CWE-706 Use of Incorrectly-Resolved Name or Reference",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513",
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"shortName": "cloudflare",
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"dateUpdated": "2026-03-04T18:14:31.111Z"
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},
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"references": [
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/opennextjs/opennextjs-cloudflare/pull/1147"
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},
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{
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"tags": [
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"product"
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],
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"url": "https://www.npmjs.com/package/@opennextjs/cloudflare/v/1.17.1"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://github.com/advisories/GHSA-rvpw-p7vw-wj3m"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://www.cve.org/cverecord?id=CVE-2025-6087"
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}
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],
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"solutions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p><span style=\"background-color: transparent;\">Server-side updates to Cloudflare's Workers platform to block backslash path normalization bypasses for /cdn-cgi requests. The update automatically mitigates the issue for all existing and any future sites deployed to Cloudflare Workers.</span></p><br><br>"
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}
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],
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"value": "Server-side updates to Cloudflare's Workers platform to block backslash path normalization bypasses for /cdn-cgi requests. The update automatically mitigates the issue for all existing and any future sites deployed to Cloudflare Workers."
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},
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p><span style=\"background-color: transparent;\">In addition to the platform level fix, </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1147\"><span style=\"background-color: transparent;\">root cause fix</span></a><span style=\"background-color: transparent;\"> has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 (</span><a target=\"_blank\" rel=\"nofollow\" href=\"https://www.npmjs.com/package/@opennextjs/cloudflare\"><span style=\"background-color: transparent;\">https://www.npmjs.com/package/@opennextjs/cloudflare</span></a><span style=\"background-color: transparent;\">)</span></p><br><br>"
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}
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],
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"value": "In addition to the platform level fix, root cause fix https://github.com/opennextjs/opennextjs-cloudflare/pull/1147 has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 ( https://www.npmjs.com/package/@opennextjs/cloudflare https://www.npmjs.com/package/@opennextjs/cloudflare )"
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},
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1150\"><span style=\"background-color: transparent;\">Dependency update</span></a><span style=\"background-color: transparent;\"> to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next.</span><br>"
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}
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],
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"value": "Dependency update https://github.com/opennextjs/opennextjs-cloudflare/pull/1150 to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next."
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}
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],
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"source": {
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"discovery": "UNKNOWN"
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},
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"title": "SSRF vulnerability in opennextjs-cloudflare via /cdn-cgi/ path normalization bypass",
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"x_generator": {
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"engine": "Vulnogram 0.5.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-03-04T18:58:41.207814Z",
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"id": "CVE-2026-3125",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-03-04T18:58:56.614Z"
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}
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}
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]
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}
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} |