CVE-2026-3833: Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison
CSIRTS triage
- What
- GnuTLS incorrectly performs case-sensitive comparison for name constraints validation, allowing policy bypass.
- Who is affected
- Applications using GnuTLS for certificate validation and name constraint enforcement.
- Urgency
- Medium priority with CVSS 6.5; bypasses certificate policy controls.
- Action
- Update GnuTLS to a version with case-insensitive name constraint comparison.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3833
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-38330.56% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 44% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-3833 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[UPDATE] [high] GnuTLS: Multiple vulnerabilitiescert-bund
- unknownUSN-8502-1: GnuTLS vulnerabilitiesubuntu
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