Is there a public exploit for CVE-2026-59993?

No public exploit for CVE-2026-59993 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-59993?

CVE-2026-59993 scores CVSS 6.5 (v3.1), rated medium.

6.5 Medium

Picotls is a TLS protocol library that allows users select different crypto backends based on their use case.

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 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.

Assessment

CVSS: 6.5 (v3.1)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 30 October 2026
Last updated: 30 October 2026
Weakness: CWE-476
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

At the source

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