CVE-2026-42015: Gnutls: gnutls: memory corruption due to off-by-one error in pkcs#12 bag handling

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-26 · updated 2026-10-14
Weakness: CWE-193

Description

A flaw was found in gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.

Affected products

Red Hat Cert Manager support for Red Hat OpenShift release 1.17: all versions — fixed in 1791371069, 1791371080, 1791788287, 1791970484
Red Hat Cert Manager support for Red Hat OpenShift release 1.18: all versions — fixed in 1789029076, 1791459707, 1791459711, 1791459759, 1791966259
Red Hat Cert Manager support for Red Hat OpenShift release 1.20: all versions — fixed in 1790598593
Red Hat OpenShift Container Platform 4.18: all versions
Red Hat Discovery 2: all versions — fixed in 1782159791, 1782166952
Red Hat Enterprise Linux 10: all versions — fixed in 0:3.8.10-4.el10_2
Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:3.8.9-9.el10_0.19
Red Hat Enterprise Linux 7 Extended Lifecycle Support: all versions — fixed in 0:3.3.29-9.el7_9.2
Red Hat Enterprise Linux 8: all versions — fixed in 0:3.6.16-8.el8_10.6
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: all versions — fixed in 0:3.6.14-10.el8_4.1, 0:4.13-3.el8_4.1
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: all versions — fixed in 0:3.6.14-10.el8_4.1, 0:4.13-3.el8_4.1
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 0:3.6.16-5.el8_6.5, 0:4.13-3.el8_6.2
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: all versions — fixed in 0:3.6.16-5.el8_6.5, 0:4.13-3.el8_6.2
Red Hat Enterprise Linux 8.8 Telecommunications Update Service: all versions — fixed in 0:3.6.16-7.el8_8.4, 0:4.13-4.el8_8.1
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: all versions — fixed in 0:3.6.16-7.el8_8.4, 0:4.13-4.el8_8.1
Red Hat Enterprise Linux 9: all versions — fixed in 0:3.8.10-4.el9_8
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:3.7.6-21.el9_2.7
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:3.8.3-4.el9_4.6
Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:3.8.3-6.el9_6.4
Red Hat Hardened Images: all versions — fixed in 3.8.13-1.hum1
Red Hat OpenShift AI 3.4: all versions — fixed in 1790703542
Red Hat Update Infrastructure 5: all versions — fixed in 1781525671, 1781525684, 1781525693, 1781525739, 1787135742, 1787241211

How to fix

Upgrade to a fixed version: Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371069, 1791371080, 1791788287, 1791970484; Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1789029076, 1791459707, 1791459711, 1791459759; Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790598593; Red Hat Discovery 2 1782159791, 1782166952; Red Hat Enterprise Linux 10 0:3.8.10-4.el10_2; Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.8.9-9.el10_0.19; Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:3.3.29-9.el7_9.2; Red Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:3.6.14-10.el8_4.1, 0:4.13-3.el8_4.1; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:3.6.14-10.el8_4.1, 0:4.13-3.el8_4.1; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:3.6.16-5.el8_6.5, 0:4.13-3.el8_6.2; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:3.6.16-5.el8_6.5, 0:4.13-3.el8_6.2. Check the vendor advisory for mitigations.

References

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