164 lines
7.8 KiB
JSON
164 lines
7.8 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-2026-3635",
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"assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
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"state": "PUBLISHED",
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"assignerShortName": "openjs",
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"dateReserved": "2026-03-06T09:16:35.081Z",
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"datePublished": "2026-03-23T13:53:00.386Z",
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"dateUpdated": "2026-03-23T15:30:10.526Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
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"shortName": "openjs",
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"dateUpdated": "2026-03-23T13:53:00.386Z"
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},
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"title": "Fastify request.protocol and request.host spoofable via X-Forwarded-Proto/Host from untrusted connections when trustProxy uses restrictive trust function",
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"cweId": "CWE-348",
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"description": "CWE-348 Use of less trusted source",
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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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"affected": [
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{
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"vendor": "fastify",
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"product": "fastify",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"lessThanOrEqual": "5.8.2",
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"versionType": "semver"
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},
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{
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"status": "unaffected",
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"version": "5.8.3",
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"versionType": "semver"
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}
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],
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"defaultStatus": "unaffected",
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"packageURL": "pkg:npm/fastify"
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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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"value": "Summary\nWhen trustProxy is configured with a restrictive trust function (e.g., a specific IP like trustProxy: '10.0.0.1', a subnet, a hop count, or a custom function), the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection — including connections from untrusted IPs. This allows an attacker connecting directly to Fastify (bypassing the proxy) to spoof both the protocol and host seen by the application.\n\nAffected Versions\nfastify <= 5.8.2\n\nImpact\nApplications using request.protocol or request.host for security decisions (HTTPS enforcement, secure cookie flags, CSRF origin checks, URL construction, host-based routing) are affected when trustProxy is configured with a restrictive trust function.\n\nWhen trustProxy: true (trust everything), both host and protocol trust all forwarded headers — this is expected behavior. The vulnerability only manifests with restrictive trust configurations.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "<p><b>Summary</b><br>When trustProxy is configured with a restrictive trust function (e.g., a specific IP like trustProxy: '10.0.0.1', a subnet, a hop count, or a custom function), the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection — including connections from untrusted IPs. This allows an attacker connecting directly to Fastify (bypassing the proxy) to spoof both the protocol and host seen by the application.<br><br><b>Affected Versions<br></b>fastify <= 5.8.2<br><br><b>Impact<br></b>Applications using request.protocol or request.host for security decisions (HTTPS enforcement, secure cookie flags, CSRF origin checks, URL construction, host-based routing) are affected when trustProxy is configured with a restrictive trust function.<br><br>When trustProxy: true (trust everything), both host and protocol trust all forwarded headers — this is expected behavior. The vulnerability only manifests with restrictive trust configurations.</p>"
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}
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]
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}
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],
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"references": [
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{
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"url": "https://github.com/fastify/fastify/security/advisories/GHSA-444r-cwp2-x5xf"
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},
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-3635"
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},
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{
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"url": "https://cna.openjsf.org/security-advisories.html"
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}
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],
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"metrics": [
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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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"cvssV3_1": {
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"version": "3.1",
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"attackVector": "ADJACENT_NETWORK",
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"attackComplexity": "HIGH",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "CHANGED",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "NONE",
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"availabilityImpact": "NONE",
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"baseSeverity": "MEDIUM",
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"baseScore": 6.1,
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"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N"
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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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"value": "LetaoZhao (TinkAnet)",
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"type": "reporter"
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},
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{
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"lang": "en",
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"value": "KaKa (climba03003)",
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"type": "remediation reviewer"
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},
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{
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"lang": "en",
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"value": "Matteo Collina",
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"type": "remediation reviewer"
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},
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{
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"lang": "en",
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"value": "Ulises Gascón",
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"type": "remediation reviewer"
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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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},
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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": "2026-03-23T15:29:15.532885Z",
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"id": "CVE-2026-3635",
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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": "no"
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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": "2026-03-23T15:30:10.526Z"
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}
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}
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]
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}
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} |