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

Description (CNA)

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 (CNA)

Vendor / product	Versions
quinn-rs / quinn	affected < 0.11.14

CWE

CWE-248

References

https://github.com/quinn-rs/quinn/security/advisories/GHSA-6xvm-j4wr-6v98

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in quinn-proto, a pure-Rust implementation of the IETF QUIC transport protocol. 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.