200 lines
8.6 KiB
JSON
200 lines
8.6 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-2026-80347",
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"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"state": "PUBLISHED",
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"assignerShortName": "VulnCheck",
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"dateReserved": "2026-08-26T09:56:49.602Z",
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"datePublished": "2026-08-26T10:09:47.977Z",
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"dateUpdated": "2026-08-26T12:05:24.996Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"shortName": "VulnCheck",
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"dateUpdated": "2026-08-26T10:09:47.977Z"
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},
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"datePublic": "2026-08-26T00:00:00.000Z",
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"title": "mcp-fetch through 1.6.3 Server-Side Request Forgery via Unstripped IPv6 Literal Brackets",
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"descriptions": [
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{
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"lang": "en",
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"value": "mcp-fetch checks a fetch target against its SSRF guard without removing the brackets that surround an IPv6 literal. isSafeUrl reads the hostname from the parsed URL, which for a literal such as http://[::1]/ yields the bracketed string, and then tests it with net.isIP. That call returns zero for a bracketed value, so the branch holding the private-address checks is skipped entirely. The guard falls back to resolving the hostname, the bracketed string is not a resolvable name, no addresses are returned, and the target is reported safe. The HTTP client then strips the brackets and connects. Because the address may be given in IPv4-mapped form, the same path reaches any IPv4 target the loopback and private checks were meant to exclude, including link-local metadata endpoints. isPrivateIPv6 also has no case for the ::ffff: prefix, so the mapped form would still pass even if the brackets were removed. The fetch target is supplied as a tool argument, so an attacker who can influence what the model requests can read internal responses back into the model context."
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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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"lang": "en",
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"cweId": "CWE-918",
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"description": "Server-Side Request Forgery (SSRF)",
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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": "kazuph",
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"product": "mcp-fetch",
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"collectionURL": "https://github.com/kazuph/mcp-fetch",
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"repo": "https://github.com/kazuph/mcp-fetch",
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"defaultStatus": "unaffected",
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"versions": [
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{
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"version": "0",
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"lessThanOrEqual": "1.6.3",
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"status": "affected",
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"versionType": "semver"
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}
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],
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"packageURL": "pkg:npm/%40kazuph/mcp-fetch"
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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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"cvssV4_0": {
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "HIGH",
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"subConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "NONE",
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"subAvailabilityImpact": "NONE",
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"exploitMaturity": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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"vulnerabilityResponseEffort": "NOT_DEFINED",
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"providerUrgency": "NOT_DEFINED",
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"version": "4.0",
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"baseSeverity": "HIGH",
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"baseScore": 8.7,
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
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}
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},
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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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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "NONE",
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"availabilityImpact": "NONE",
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"version": "3.1",
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"baseSeverity": "HIGH",
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"baseScore": 7.5,
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
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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/kazuph/mcp-fetch",
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"tags": [
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"product"
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]
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},
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{
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"url": "https://github.com/kazuph/mcp-fetch/issues/16",
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"tags": [
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"issue-tracking"
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]
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},
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{
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"url": "https://www.npmjs.com/package/@kazuph/mcp-fetch",
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"tags": [
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"product"
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]
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},
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{
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"name": "VulnCheck Advisory: mcp-fetch through 1.6.3 Server-Side Request Forgery via Unstripped IPv6 Literal Brackets",
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"tags": [
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"third-party-advisory"
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],
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"url": "https://www.vulncheck.com/advisories/mcp-fetch-through-1.6.3-server-side-request-forgery-via-unstripped-ipv6-literal-brackets"
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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": "George Chen",
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"type": "finder"
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}
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],
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"x_generator": {
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"engine": "vulncheck-endgame"
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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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"references": [
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{
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"url": "https://github.com/kazuph/mcp-fetch/issues/16",
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"tags": [
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"exploit"
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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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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-26T12:05:01.381249Z",
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"id": "CVE-2026-80347",
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"options": [
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{
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"Exploitation": "poc"
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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": "2026-08-26T12:05:24.996Z"
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}
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}
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]
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}
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} |