MEDIUM 6.5 NVD
CVE-2026-59993
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. In affected revisions through 44bc503, when picotl
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. In affected revisions through 44bc503, when picotls is used as a `client-side TLS stack`, a peer can send a `HelloRetryRequest` followed by a `spoofed Hello message` that causes a null-pointer dereference. This can terminate the consuming process, including a process performing other work, resulting in denial of service. This issue is fixed in commit a06ca41.
References
- https://github.com/h2o/picotls/commit/a06ca417a16f9126808bf5cabe6c5e6e0f16ecae
- https://github.com/h2o/picotls/pull/608
- https://github.com/h2o/picotls/security/advisories/GHSA-2xcv-h2pg-m99c
This medium severity vulnerability with a CVSS score of 6.5 was published on 2026-10-30 via NVD.
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