An off-by-one error in the PKCS#12 bag element bounds check in the gnutls library on Red Hat Enterprise Linux 10 allows a remote attacker to write beyond the internal array boundary when appending to a PKCS#12 bag with 32 elements. This memory corruption vulnerability can cause denial of service or other unspecified impacts. The issue is tracked as CVE-2026-42015 with a CVSS 3.1 base score of 5.3 (medium severity). Red Hat has released security advisories (RHSA-2026:13274 and RHSA-2026:20611) describing updates to gnutls packages, primarily for Red Hat Hardened Images and Red Hat Enterprise Linux 8, but no explicit fixed version or patch details for Red Hat Enterprise Linux 10 are provided in the input. The vendor advisory URLs should be monitored for updates and patch availability.

The vulnerability allows remote attackers to cause memory corruption by writing past the bounds of an internal array in the gnutls PKCS#12 bag element. This can lead to denial of service (application or system crash) and potentially other unspecified impacts due to memory corruption. There is no indication of confidentiality or integrity impact. No known exploits in the wild have been reported at this time.

Red Hat has published security advisories recommending updating the gnutls packages. While explicit patch availability for Red Hat Enterprise Linux 10 is not confirmed in the provided data, related advisories for Red Hat Hardened Images and Red Hat Enterprise Linux 8 indicate updates are available. Users should follow the vendor advisory at https://access.redhat.com/security/cve/CVE-2026-42015 and the errata RHSA-2026:13274 for instructions on applying updates. Patch status is not yet confirmed for Red Hat Enterprise Linux 10 — check the vendor advisory for current remediation guidance.