{"cve":"CVE-2026-11941","nvd":{"published":"2026-06-19T12:16:26.137","modified":"2026-10-25T23:10:00.167","status":"Awaiting Analysis","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-416"],"references":["https://github.com/cloudflare/quiche/security/advisories/GHSA-mh64-ph39-mrc9"],"products":[],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-11941","score":0.00251,"percentile":0.16279,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-mh64-ph39-mrc9","url":"https://osv.dev/vulnerability/GHSA-mh64-ph39-mrc9","summary":"Cloudflare Quiche: Use-after-free in connection ID iterator FFI functions","modified":"2026-06-19T22:26:27.221270Z","packages":[{"ecosystem":"crates.io","name":"quiche","purl":"pkg:cargo/quiche","ranges":[">=0.20.0 <0.29.2"],"fixed":["0.29.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}