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CVE record · CVE-2026-59993

Picotls has NULL pointer dereference during handshake, when running as a client

CVSS 6.5 MediumEPSS 0.0025 · 16th percentile

Published by the CVE Program (CNA: GitHub_M) at 30 Oct 2026, 21:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
h2o picotls
  • affected < a06ca417a16f9126808bf5cabe6c5e6e0f16ecae
Identifiers
CVE-2026-59993
CNA
GitHub_M
Weakness (CWE)
CWE-476
Tags
Published
30 Oct 2026
Updated
6 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0025, the 16th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 30 Oct 2026, 21:01 UTC Confirmed by the CVE List
  2. 30 Oct 2026, 21:17 UTC Confirmed by NVD

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.