Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.
Exact source revision recorded 3 Nov 2026 03:08:12 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-38003
PublishedCloudflare 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.
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Original publisher date fields
datePublished: Jun 19, 2026, 9:55:54 AM
dateUpdated: Jun 22, 2026, 3:10:00 PM
- Source published
- Jun 19, 2026, 9:55:54 AM (timezone not stated)
- Source modified
- Jun 22, 2026, 3:10:00 PM (timezone not stated)
- Observed here
- 3 Nov 2026 03:08:12 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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EUVD CVSS 3.1 · 5.6 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L