{"id":"CVE-2026-11941","title":"Cloudflare Quiche: Use-after-free in connection ID iterator FFI functions","summary":"Cloudflare Quiche: Use-after-free in connection ID iterator FFI functions","severity":"medium","cvss":5.6,"cwe":["CWE-416"],"vendor":"quiche","product":"quiche","ecosystem":"rust","affected":["quiche >= 0.20.0, < 0.29.2"],"patched":["quiche 0.29.2"],"published":"2026-06-19","updated":"2026-06-19","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-mh64-ph39-mrc9","references":[{"url":"https://github.com/cloudflare/quiche/security/advisories/GHSA-mh64-ph39-mrc9"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11941"},{"url":"https://github.com/advisories/GHSA-mh64-ph39-mrc9"}],"tags":["ghsa","rust"],"epss":0.00251,"epssPercentile":0.16742,"ingestedAt":"2026-06-22T13:35:24.216Z","slug":"CVE-2026-11941","body":"## Overview\n\n### 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.\n\n## Affected packages\n\n- `quiche >= 0.20.0, < 0.29.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `quiche 0.29.2`","depth":"sunlit","depthScore":31,"depthScoreParts":{"impact":30.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}