CVE-2026-3832: Gnutls: gnutls: security bypass allows acceptance of revoked server certificates via crafted ocsp response

lowCVSS 3.7CVE-2026-3832

CSIRTS triage

vendor: GnuTLS product: GnuTLS Authentication bypass

What: GnuTLS accepts revoked server certificates when presented with a crafted OCSP response.
Who is affected: TLS clients using GnuTLS for certificate validation and OCSP stapling.
Urgency: Low severity (CVSS 3.7); authentication bypass but requires crafted OCSP response.
Action: Apply GnuTLS patch validating OCSP responses correctly and rejecting revoked certificates.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: low — CVSS 3.7
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3832

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-2026-38320.72% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-3832	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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Recent advisories for Gnutls

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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