CVE-2026-31812
Quinn affected by unauthenticated remote DoS via panic in QUIC transport parameter parsing
- State
- Published
- Severity
- 8.7 High
- Published
- Mar 10, 2026
- Updated
- Aug 25, 2026
- Reserved
- Mar 9, 2026
Description
Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol. Prior to 0.11.14, a remote, unauthenticated attacker can trigger a denial of service in applications using vulnerable quinn versions by sending a crafted QUIC Initial packet containing malformed quic_transport_parameters. In quinn-proto parsing logic, attacker-controlled varints are decoded with unwrap(), so truncated encodings cause Err(UnexpectedEnd) and panic. This is reachable over the network with a single packet and no prior trust or authentication. This vulnerability is fixed in 0.11.14.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | GitHub_M |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | redhat-SADP |
Weaknesses
- CWE-248 Uncaught Exception
Affected Products
| Product | Versions |
|---|---|
quinnquinn-rs |
|
References
- https://github.com/quinn-rs/quinn/security/advisories/GHSA-6xvm-j4wr-6v98
- https://access.redhat.com/security/cve/CVE-2026-31812vdb-entry
- RHBZ#2446330issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31812.json
- https://access.redhat.com/errata/RHSA-2026:22862vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:13545vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19712vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:5459vendor-advisory
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