Frontier models can vanish overnight. Control is the new frontier in security AI.See why→

CVE-2026-42013

Discovered by AISLEPUBLISHEDCWE-295

Description

A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.

CVSS Base Scores

CVSS v3.1(Primary)
8.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Affected Products

VendorProductVersionStatus
Red HatGnuTLS0:3.8.10-4.el10_2unaffected
Red HatGnuTLS0:3.8.9-9.el10_0.19—
Red HatGnuTLS0:3.6.16-8.el8_10.6—
Red HatGnuTLS0:3.6.14-10.el8_4.1—
Red HatGnuTLS0:4.13-3.el8_4.1—
Red HatGnuTLS0:3.6.16-5.el8_6.5—
Red HatGnuTLS0:4.13-3.el8_6.2—
Red HatGnuTLS0:3.6.16-7.el8_8.4—
Red HatGnuTLS0:4.13-4.el8_8.1—
Red HatGnuTLS0:3.8.10-4.el9_8—
Red HatGnuTLS0:3.8.3-4.el9_4.6—
Red HatGnuTLS0:3.8.3-6.el9_6.4—
Red HatGnuTLS1782159791—
Red HatGnuTLS1782166952—
Red HatGnuTLS1781525684—
Red HatGnuTLS1781525671—
Red HatGnuTLS1781525693—
Red HatGnuTLS1781525739—

Credits

  • Red Hat would like to thank Haruto Kimura (Stella) and Joshua Rogers (AISLE Research Team) for reporting this issue.

References