CVE-2026-11941

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-11941
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11941.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-11941
Aliases
Published
2026-06-19T09:55:54.501Z
Modified
2026-07-08T08:12:40.289590457Z
Severity
  • 5.6 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
Summary
Use-after-free in connection ID iterator and FFI functions
Details

Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions.

The “quicheconnectioniditernext” and “quicheconnretiredscidnext” 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11941.json",
    "cna_assigner": "cloudflare",
    "cwe_ids": [
        "CWE-416"
    ]
}
References

Affected packages

Git / github.com/cloudflare/quiche

Affected ranges

Type
GIT
Repo
https://github.com/cloudflare/quiche
Events
Introduced
5b1e3d286411e2cc411f8dc6d6ff1ee40f1bd026
Last affected
f0c7193c3b130d766f0d6f3e75d4f2405c85d376
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0.20.0"
        },
        {
            "last_affected": "0.29.1"
        }
    ]
}

Affected versions

0.*
0.20.0
0.21.0
0.22.0
0.23.0
0.23.1
0.23.2
0.23.3
0.23.4
0.23.5
0.23.6
0.23.7
0.24.0
0.24.1
0.24.2
0.24.3
0.24.4
0.24.5
0.24.6
0.24.7
0.24.8
0.24.9
0.25.0
0.26.0
0.26.1
0.27.0
0.28.0
0.29.0
0.29.1
buffer-pool-0.*
buffer-pool-0.1.0
buffer-pool-0.2.0
buffer-pool-0.2.1
datagram-socket-0.*
datagram-socket-0.1.0
datagram-socket-0.1.1
datagram-socket-0.2.0
datagram-socket-0.3.0
datagram-socket-0.4.0
datagram-socket-0.5.0
datagram-socket-0.6.0
datagram-socket-0.7.0
datagram-socket-0.8.0
h3i-0.*
h3i-0.2.0
h3i-0.3.0
h3i-0.4.0
h3i-0.6.0
netlog-0.*
netlog-0.1.0
octets-0.*
octets-0.3.0
octets-0.3.1
octets-0.3.2
octets-0.3.3
octets-0.3.4
octets-0.3.5
qlog-0.*
qlog-0.11.0
qlog-0.12.0
qlog-0.13.0
qlog-0.14.0
qlog-0.15.0
qlog-0.15.1
qlog-0.15.2
qlog-0.16.0
qlog-0.17.0
qlog-0.18.0
task-killswitch-0.*
task-killswitch-0.1.0
task-killswitch-0.1.1
task-killswitch-0.2.0
task-killswitch-0.2.1
tokio-quiche-0.*
tokio-quiche-0.1.0
tokio-quiche-0.10.0
tokio-quiche-0.11.0
tokio-quiche-0.12.0
tokio-quiche-0.13.0
tokio-quiche-0.14.0
tokio-quiche-0.14.1
tokio-quiche-0.14.2
tokio-quiche-0.15.0
tokio-quiche-0.16.0
tokio-quiche-0.18.0
tokio-quiche-0.19.0
tokio-quiche-0.2.0
tokio-quiche-0.2.1
tokio-quiche-0.2.2
tokio-quiche-0.3.0
tokio-quiche-0.3.1
tokio-quiche-0.3.2
tokio-quiche-0.4.0
tokio-quiche-0.4.1
tokio-quiche-0.4.2
tokio-quiche-0.5.0
tokio-quiche-0.6.0
tokio-quiche-0.6.1
tokio-quiche-0.7.0
tokio-quiche-0.7.1
tokio-quiche-0.8.0
tokio-quiche-0.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11941.json"