{"id":"UBUNTU-CVE-2026-31812","details":"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.","modified":"2026-06-30T18:17:49.232721317Z","published":"2026-03-10T22:16:00Z","upstream":["CVE-2026-31812"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-31812"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-31812"},{"type":"REPORT","url":"https://rustsec.org/advisories/RUSTSEC-2026-0037.html"},{"type":"REPORT","url":"https://github.com/quinn-rs/quinn/security/advisories/GHSA-6xvm-j4wr-6v98"},{"type":"REPORT","url":"https://github.com/quinn-rs/quinn/pull/2558"}],"affected":[{"package":{"name":"rust-quinn-proto","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/rust-quinn-proto?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.2-1","0.10.5-2","0.10.6-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-quinn-proto-dev","binary_version":"0.10.6-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-31812.json"}},{"package":{"name":"rust-quinn-proto","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/rust-quinn-proto?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.6-1","0.11.9-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.11.9-1","binary_name":"librust-quinn-proto-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-31812.json"}},{"package":{"name":"rust-quinn-proto","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rust-quinn-proto?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11.9-1","0.11.9-3"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-quinn-proto-dev","binary_version":"0.11.9-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-31812.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}