{"id":"CVE-2026-11941","revision":null,"records":[{"revision":"2aee2db4de7d409e8f99c366cdc3ca7c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-11941","aliases":[],"title":"Use-after-free in connection ID iterator and FFI functions","description":"Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.\n\n\n\nThe “quiche_connection_id_iter_next” and “quiche_conn_retired_scid_next” functions would return a pointer to a “ConnectionId” to the applications via function arguments, but the owned “ConnectionId” would be dropped at the end of those functions' scope.\n\n\n\nOnly applications using those FFI functions are affected. The FFI API is disabled by default by a build-time feature flag.\n\n\n\nImpact\nIf unpatched, an application calling the affected FFI functions will dereference freed memory. The most likely outcome is undefined behavior leading to a process crash (denial of service). Depending on allocator state, the read may also return adjacent heap contents, resulting in limited information disclosure or incorrect connection identifier handling.\n\n\n\nMitigation\nUsers are requested to upgrade to quiche 0.29.2 which is the earliest version containing the fix for this issue.","state":0,"publishedAt":"2026-06-19T09:55:54.501+00:00","modifiedAt":"2026-06-22T15:10:00.033+00:00","affected":[{"ecosystem":"Vendor product","name":"Quiche","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Cloudflare\",\n                    \"product\": \"Quiche\",\n                    \"repo\": \"https://github.com/cloudflare/quiche\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0.20.0\",\n                            \"lessThanOrEqual\": \"0.29.1\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","score":5.6,"severity":"MEDIUM"}],"references":["https://github.com/cloudflare/quiche/security/advisories/GHSA-mh64-ph39-mrc9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-11941","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-11941","identifiers":["CVE-2026-11941"]},"retained":false,"historicalAffected":[]},{"revision":"5925daac32664661979518188f32ac2c","observedAt":"2026-11-07T04:37:28.652+00:00","statement":{"source":"euvd","id":"EUVD-2026-38003","aliases":["CVE-2026-11941","GHSA-mh64-ph39-mrc9"],"title":"Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.","description":"Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.\n\n\n\nThe “quiche_connection_id_iter_next” and “quiche_conn_retired_scid_next” functions would return a pointer to a “ConnectionId” to the applications via function arguments, but the owned “ConnectionId” would be dropped at the end of those functions' scope.\n\n\n\nOnly applications using those FFI functions are affected. The FFI API is disabled by default by a build-time feature flag.\n\n\n\nImpact\nIf unpatched, an application calling the affected FFI functions will dereference freed memory. The most likely outcome is undefined behavior leading to a process crash (denial of service). Depending on allocator state, the read may also return adjacent heap contents, resulting in limited information disclosure or incorrect connection identifier handling.\n\n\n\nMitigation\nUsers are requested to upgrade to quiche 0.29.2 which is the earliest version containing the fix for this issue.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","score":5.6,"severity":null}],"references":["https://github.com/cloudflare/quiche/security/advisories/GHSA-mh64-ph39-mrc9"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38003","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 19, 2026, 9:55:54 AM","dateUpdated":"Jun 22, 2026, 3:10:00 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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The FFI API is disabled by default by a build-time feature flag.\n\n\n\nImpact\nIf unpatched, an application calling the affected FFI functions will dereference freed memory. The most likely outcome is undefined behavior leading to a process crash (denial of service). Depending on allocator state, the read may also return adjacent heap contents, resulting in limited information disclosure or incorrect connection identifier handling.\n\n\n\nMitigation\nUsers are requested to upgrade to quiche 0.29.2 which is the earliest version containing the fix for this issue.","state":0,"publishedAt":"2026-06-19T12:16:26.137+00:00","modifiedAt":"2026-10-25T23:10:00.167+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · cna@cloudflare.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","score":5.6,"severity":"MEDIUM"}],"references":["https://github.com/cloudflare/quiche/security/advisories/GHSA-mh64-ph39-mrc9"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-11941","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-416"],"productCriteria":[],"sourceDates":{"published":"2026-06-19T12:16:26.137","lastModified":"2026-10-25T23:10:00.167"},"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-2026-11941","identifiers":["CVE-2026-11941"]},"retained":false,"historicalAffected":[]},{"revision":"5e8049dff08c4562a06459da954a4034","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-mh64-ph39-mrc9","aliases":["CVE-2026-11941"],"title":"Cloudflare Quiche: Use-after-free in connection ID iterator FFI functions","description":"### Impact\n\nCloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.\n\nThe `quiche_connection_id_iter_next` and `quiche_conn_retired_scid_next` functions would return a pointer to a `ConnectionId` to the applications via function arguments, but the the owned `ConnectionId` would be dropped at the end of those functions' scope.\n\nOnly applications using those FFI functions are affected. The FFI API is disabled by default by a build-time feature flag.\n\nquiche 0.29.2 is the earliest version containing the fix for this issue.","state":0,"publishedAt":"2026-06-19T22:10:29+00:00","modifiedAt":"2026-06-19T22:26:27.22127+00:00","affected":[{"ecosystem":"crates.io","name":"quiche","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.20.0"},{"kind":"fixed","version":"0.29.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/cloudflare/quiche/security/advisories/GHSA-mh64-ph39-mrc9","https://nvd.nist.gov/vuln/detail/CVE-2026-11941","https://github.com/cloudflare/quiche"],"sourceUrl":"https://github.com/advisories/GHSA-mh64-ph39-mrc9","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-mh64-ph39-mrc9","identifiers":["GHSA-mh64-ph39-mrc9","CVE-2026-11941"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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