{"id":"CVE-2025-64527","revision":null,"records":[{"revision":"5bffae5ab6944a27894e621040b80363","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-64527","aliases":[],"title":"Envoy crashes when JWT authentication is configured with the remote JWKS fetching","description":"Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, Envoy crashes when JWT authentication is configured with the remote JWKS fetching, allow_missing_or_failed is enabled, multiple JWT tokens are present in the request headers and the JWKS fetch fails. This is caused by a re-entry bug in the JwksFetcherImpl. When the first token's JWKS fetch fails, onJwksError() callback triggers processing of the second token, which calls fetch() again on the same fetcher object. The original callback's reset() then clears the second fetch's state (receiver_ and request_) which causes a crash when the async HTTP response arrives.","state":0,"publishedAt":"2025-12-03T18:04:35.16+00:00","modifiedAt":"2025-12-03T20:18:19.588+00:00","affected":[{"ecosystem":"Vendor product","name":"envoy","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"envoyproxy\",\n                    \"product\": \"envoy\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.36.0, <= 1.36.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.35.0, <= 1.35.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.34.0, <= 1.34.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"<= 1.33.12\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-mp85-7mrq-r866"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-64527","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-64527","identifiers":["CVE-2025-64527"]},"retained":false,"historicalAffected":[]},{"revision":"f30aadcf6e7242d68011895e483642b8","observedAt":"2026-11-11T04:31:51.331+00:00","statement":{"source":"euvd","id":"EUVD-2025-201100","aliases":["CVE-2025-64527","GHSA-mp85-7mrq-r866"],"title":"Envoy is a high-performance edge/middle/service proxy. 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The original callback's reset() then clears the second fetch's state (receiver_ and request_) which causes a crash when the async HTTP response arrives.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5,"severity":null}],"references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-mp85-7mrq-r866"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-201100","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Dec 3, 2025, 6:04:35 PM","dateUpdated":"Dec 3, 2025, 8:18:19 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2025-201100","identifiers":["EUVD-2025-201100","CVE-2025-64527","GHSA-mp85-7mrq-r866"]},"retained":false,"historicalAffected":[]},{"revision":"a2c8bdee81b04b64adba8aeee7cc97cd","observedAt":"2026-10-25T03:17:29.935+00:00","statement":{"source":"nvd","id":"CVE-2025-64527","aliases":[],"title":"Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, Envoy crashes when JWT authentication is configured with the remote JWKS fetching, allow_missing_or_failed is enabled, multiple JWT tok…","description":"Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, Envoy crashes when JWT authentication is configured with the remote JWKS fetching, allow_missing_or_failed is enabled, multiple JWT tokens are present in the request headers and the JWKS fetch fails. This is caused by a re-entry bug in the JwksFetcherImpl. When the first token's JWKS fetch fails, onJwksError() callback triggers processing of the second token, which calls fetch() again on the same fetcher object. The original callback's reset() then clears the second fetch's state (receiver_ and request_) which causes a crash when the async HTTP response arrives.","state":0,"publishedAt":"2025-12-03T18:15:46.863+00:00","modifiedAt":"2026-09-25T23:10:00.463+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-mp85-7mrq-r866"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-64527","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-476"],"productCriteria":["cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2025-12-03T18:15:46.863","lastModified":"2026-09-25T23:10:00.463"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2025-64527","identifiers":["CVE-2025-64527"]},"retained":false,"historicalAffected":[]},{"revision":"438efc03c5b34566a8090b864fcb8126","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-mp85-7mrq-r866","aliases":["BIT-envoy-2025-64527","CVE-2025-64527"],"title":"Envoy crashes when JWT authentication is configured with the remote JWKS fetching","description":"### Summary\nEnvoy crashes when JWT authentication is configured with the remote JWKS fetching, `allow_missing_or_failed` is enabled, multiple JWT tokens are present in the request headers and the JWKS fetch fails.\n\n### Details\nThis is caused by a re-entry bug in the `JwksFetcherImpl`. When the first token's JWKS fetch fails, `onJwksError()` callback triggers processing of the second token, which calls fetch() again on the same fetcher object.\n\nThe original callback's reset() then clears the second fetch's state (`receiver_ and request_`) which causes a crash when the async HTTP response arrives.\n\n### PoC\n* `allow_missing_or_failed` or `allow_missing` is enabled\n* The client send 2 Authorization headers\n* the remote JWKS fetching failed\n* There will be crash\n\n### Impact\nDoS and Crash\n\n### Mitigation\n* Disable the `allow_missing_or_failed` or `allow_missing`","state":0,"publishedAt":"2025-12-05T18:12:39+00:00","modifiedAt":"2025-12-06T12:29:15.337458+00:00","affected":[{"ecosystem":"Go","name":"github.com/envoyproxy/envoy","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.36.0"},{"kind":"fixed","version":"1.36.3"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/envoyproxy/envoy","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.35.0"},{"kind":"fixed","version":"1.35.7"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/envoyproxy/envoy","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.34.0"},{"kind":"fixed","version":"1.34.11"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/envoyproxy/envoy","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.33.13"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-mp85-7mrq-r866","https://nvd.nist.gov/vuln/detail/CVE-2025-64527","https://github.com/envoyproxy/envoy"],"sourceUrl":"https://github.com/advisories/GHSA-mp85-7mrq-r866","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-mp85-7mrq-r866","identifiers":["GHSA-mp85-7mrq-r866","BIT-envoy-2025-64527","CVE-2025-64527"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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