{"cve":"CVE-2026-31812","nvd":{"published":"2026-03-10T22:16:18.840","modified":"2026-08-25T13:18:17.813","status":"Deferred","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.","cvss_v4":{"vector":"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","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-248"],"references":["https://github.com/quinn-rs/quinn/security/advisories/GHSA-6xvm-j4wr-6v98","https://access.redhat.com/errata/RHSA-2026:13545","https://access.redhat.com/errata/RHSA-2026:19712","https://access.redhat.com/errata/RHSA-2026:22862","https://access.redhat.com/errata/RHSA-2026:5459"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-31812","score":0.0052,"percentile":0.44222,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6xvm-j4wr-6v98","url":"https://osv.dev/vulnerability/GHSA-6xvm-j4wr-6v98","summary":"Quinn affected by unauthenticated remote DoS via panic in QUIC transport parameter parsing","modified":"2026-09-10T03:50:37.796449419Z","packages":[{"ecosystem":"crates.io","name":"quinn-proto","purl":"pkg:cargo/quinn-proto","ranges":["<0.11.14"],"fixed":["0.11.14"]}]},{"id":"RUSTSEC-2026-0037","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0037","summary":"Denial of service in Quinn endpoints","modified":"2026-03-14T07:30:14.675976Z","packages":[{"ecosystem":"crates.io","name":"quinn-proto","purl":"pkg:cargo/quinn-proto","ranges":[">=0.5.0 <0.11.14"],"fixed":["0.11.14"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}