CVE-2025-61684

Quicly, an IETF QUIC protocol implementation, is susceptible to a denial-of-service attack prior to commit d9d3df6a8530a102b57d840e39b0311ce5c9e14e. A remote attacker can exploit these bugs to trigger an assertion failure that crashes process using Quicly. Commit d9d3df6a8530a102b57d840e39b0311ce5c9e14e fixes the issue.

Score

CVSS 3.1 7.5 High

Status

Analyzed - security-advisories@github.com

Published

2026-01-19

Last modified

2026-01-20

Weaknesses

CWE-20, CWE-617

Affected products

• Quicly (H2o)

References

• https://github.com/h2o/quicly/commit/d9d3df6a8530a102b57d840e39b0311ce5c9e14e
• https://github.com/h2o/quicly/security/advisories/GHSA-wr3c-345m-43v9