Unrated severityOSV Advisory· Published Jan 19, 2026· Updated Jan 20, 2026

Quicly has assertion failures

CVE-2025-61684

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

H2o/QuiclyOSV2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: < commit d9d3df6a8530a102b57d840e39b0311ce5c9e14e

Patches

Vulnerability mechanics

References

github.com/h2o/quicly/commit/d9d3df6a8530a102b57d840e39b0311ce5c9e14emitrex_refsource_MISC
github.com/h2o/quicly/security/advisories/GHSA-wr3c-345m-43v9mitrex_refsource_CONFIRM

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