Bug 2445762 (CVE-2026-3832) - CVE-2026-3832 gnutls: gnutls: Security bypass allows acceptance of revoked server certificates via crafted OCSP response [NEEDINFO]
Summary: CVE-2026-3832 gnutls: gnutls: Security bypass allows acceptance of revoked se...
Keywords:
Status: NEW
Alias: CVE-2026-3832
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-09 13:57 UTC by OSIDB Bzimport
Modified: 2026-06-16 16:39 UTC (History)
9 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:
mcascell: needinfo?

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:26409 0 None None None 2026-06-16 16:39:18 UTC

Description OSIDB Bzimport 2026-03-09 13:57:29 UTC 
gnutls matches a stapled ocsp response to the server certificate by scanning SingleResponse records, but then reads cert_status from record index 0 unconditionally. when a multi-record ocsp response is stapled such that record 0 is for a different certificate (good) and the matching record for the server certificate is later (revoked), a client with ocsp verification enabled can accept a revoked server certificate. this is observable as an order-dependent accept/reject outcome for the same revoked server certificate.
Comment 5 errata-xmlrpc 2026-06-16 16:39:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:26409 https://access.redhat.com/errata/RHSA-2026:26409
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