CVE-2026-11941
MediumCVSS 5.6Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
Cloudflare Quiche is affected by two use-after-free vulnerabilities in the connection ID iterator FFI functions. These functions return a pointer to 'ConnectionId' that is dropped at the end of their scope.
Risk Assessment
If unpatched, the vulnerability may lead to dereferencing freed memory, likely resulting in undefined behavior and process crashes. It may also result in limited information disclosure or incorrect connection identifier handling.
Recommendation
Users are advised to upgrade to quiche 0.29.2, which contains the fix for this issue.
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Original NVD description (English source)
Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions. The “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. Only applications using those FFI functions are affected. The FFI API is disabled by default by a build-time feature flag. Impact If 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. Mitigation Users are requested to upgrade to quiche 0.29.2 which is the earliest version containing the fix for this issue.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS