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CVE-2026-11941 — Cloudflare Quiche: Use-after-free in quiche — CVE...

MEDIUM

Cloudflare Quiche: Use-after-free in connection ID iterator FFI functions

Published June 19, 2026Updated June 19, 2026Source: osv

Summary

### Impact 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 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. quiche 0.29.2 is the earliest version containing the fix for this issue.

Advisory Timeline

  • First published June 19, 2026 (115 days ago).
  • Last revised June 19, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update quiche to 0.29.2 or later
cargo update -p quiche --precise 0.29.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
quiche
crates.io
All versions0.29.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.6 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

References

Frequently Asked Questions

What is CVE-2026-11941?
Cloudflare Quiche: Use-after-free in connection ID iterator FFI functions This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.6/10).
How do I check if my project is affected by CVE-2026-11941?
CVE-2026-11941 affects quiche. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-11941 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.6

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-mh64-ph39-mrc9

Related CVEs

  • CVE-2025-7054
    HIGH

    quiche connection ID retirement can trigger an infinite loop

  • CVE-2026-102821
    MEDIUM

    Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey

  • CVE-2026-102820
    MEDIUM

    pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a malicious Pageant agent (Windows)

More crates.io advisories

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