Log in Start free

Vulnerability · Published Mar 10, 2026 · Assigned by GitHub_M

CVE-2026-31812Quinn affected by unauthenticated remote DoS via panic in QUIC transport parameter parsing

Medium 5.3

In plain English

A medium-severity security flaw in quinn from quinn-rs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.6%top 52.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rust-quinn-protono fix listedDEBIAN-CVE-2026-31812
Debian:13rust-quinn-protono fix listedDEBIAN-CVE-2026-31812
Debian:14rust-quinn-proto0.11.14-1DEBIAN-CVE-2026-31812
Ubuntu:24.04:LTSrust-quinn-protono fix listedUBUNTU-CVE-2026-31812
Ubuntu:25.10rust-quinn-protono fix listedUBUNTU-CVE-2026-31812
Ubuntu:26.04:LTSrust-quinn-protono fix listedUBUNTU-CVE-2026-31812
Ubuntu:26.10rust-quinn-protono fix listedUBUNTU-CVE-2026-31812

Affected products (as reported)

VendorProductVersions
quinn-rs quinn < 0.11.14

Weakness: CWE-248 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References