An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU)
Description
A vulnerability in GnuTLS version 3.8.13 allows an attacker to obtain sensitive information by exploiting the failure to reject end-entity X.509 certificates that have conflicting Key Usage (KU) and Extended Key Usage (EKU) attributes. This issue could lead to unintended acceptance of malformed certificates.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in GnuTLS v3.8.13 where the software does not properly reject end-entity X.509 certificates containing contradictory combinations of Key Usage and Extended Key Usage extensions. This flaw can be exploited by an attacker to obtain sensitive information due to improper certificate validation.
Potential Impact
An attacker could leverage this vulnerability to bypass certificate validation checks, potentially leading to exposure of sensitive information. The exact impact depends on the context in which the certificate validation is used, but it involves a failure in enforcing proper certificate usage constraints.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-67693
- Cve Count
- 1
- State
- PUBLISHED
Threat ID: 6acc00d32cdf04f656feead6
Added to database: 10/11/2026, 21:34:11 UTC
Last enriched: 10/11/2026, 21:55:32 UTC
Last updated: 10/12/2026, 03:48:07 UTC
Views: 5
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