CVE-2026-42012
Fixed in a distro release EPSS <1%CVSS 7.1
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.
Products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On, Red Hat Enterprise Linux 8.8 Telecommunications Update Service, Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.6 Extended Update Support, Cert Manager support for Red Hat OpenShift release 1.17, Cert Manager support for Red Hat OpenShift release 1.18, Cert Manager support for Red Hat OpenShift release 1.20, Red Hat Discovery 2, Red Hat Hardened Images, Red Hat OpenShift AI 3.4, Red Hat Update Infrastructure 5, Red Hat Enterprise Linux 6, Red Hat OpenShift Container Platform 4
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.20 | gnutls | 3.8.13-r0 |
| Alpine 3.21 | gnutls | 3.8.13-r0 |
| Alpine 3.22 | gnutls | 3.8.13-r0 |
| Alpine 3.23 | gnutls | 3.8.13-r0 |
| Alpine 3.24 | gnutls | 3.8.13-r0 |
| Debian 12 | gnutls28 | 3.7.9-2+deb12u7 |
| Debian 13 | gnutls28 | 3.8.9-3+deb13u4 |
| Debian 14 | gnutls28 | 3.8.13-1 |
| Red Hat Enterprise Linux 10.2 | gnutls | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-c++ | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-c++-debuginfo | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-dane | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-dane-debuginfo | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-debuginfo | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-debugsource | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-devel | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-fips | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-utils | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 10.2 | gnutls-utils-debuginfo | 0:3.8.10-4.el10_2 |
| Red Hat Enterprise Linux 8 | gnutls | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 8 | gnutls-c++ | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 8 | gnutls-c++-debuginfo | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 8 | gnutls-dane | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 8 | gnutls-dane-debuginfo | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 8 | gnutls-debuginfo | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 8 | gnutls-debugsource | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 8 | gnutls-devel | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 8 | gnutls-utils | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 8 | gnutls-utils-debuginfo | 0:3.6.16-8.el8_10.6 |
| Red Hat Enterprise Linux 9 | gnutls | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux 9 | gnutls-c++ | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux 9 | gnutls-c++-debuginfo | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux 9 | gnutls-dane | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux 9 | gnutls-dane-debuginfo | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux 9 | gnutls-debuginfo | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux 9 | gnutls-debugsource | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux 9 | gnutls-devel | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux 9 | gnutls-utils | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux 9 | gnutls-utils-debuginfo | 0:3.8.10-4.el9_8 |
| Red Hat Enterprise Linux eus 10.0 | gnutls | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-c++ | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-c++-debuginfo | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-dane | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-dane-debuginfo | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-debuginfo | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-debugsource | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-devel | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-fips | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-utils | 0:3.8.9-9.el10_0.19 |
| Red Hat Enterprise Linux eus 10.0 | gnutls-utils-debuginfo | 0:3.8.9-9.el10_0.19 |
| Red Hat hummingbird 1 | gnutls | 0:3.8.13-1.hum1 |
| Red Hat hummingbird 1 | gnutls-c++ | 0:3.8.13-1.hum1 |
| Red Hat hummingbird 1 | gnutls-dane | 0:3.8.13-1.hum1 |
| Red Hat hummingbird 1 | gnutls-devel | 0:3.8.13-1.hum1 |
| Red Hat hummingbird 1 | gnutls-fips | 0:3.8.13-1.hum1 |
| Red Hat hummingbird 1 | gnutls-utils | 0:3.8.13-1.hum1 |
| Red Hat hummingbird 1 | mingw32-gnutls | 0:3.8.13-1.hum1 |
| Red Hat hummingbird 1 | mingw64-gnutls | 0:3.8.13-1.hum1 |
| Red Hat rhel aus 8.4 | gnutls | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel aus 8.4 | gnutls-c++ | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel aus 8.4 | gnutls-c++-debuginfo | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel aus 8.4 | gnutls-dane | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel aus 8.4 | gnutls-dane-debuginfo | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel aus 8.4 | gnutls-debuginfo | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel aus 8.4 | gnutls-debugsource | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel aus 8.4 | gnutls-devel | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel aus 8.4 | gnutls-utils | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel aus 8.4 | libtasn1 | 0:4.13-3.el8_4.1 |
| Red Hat rhel aus 8.4 | libtasn1-debuginfo | 0:4.13-3.el8_4.1 |
| Red Hat rhel aus 8.4 | libtasn1-debugsource | 0:4.13-3.el8_4.1 |
| Red Hat rhel aus 8.4 | libtasn1-devel | 0:4.13-3.el8_4.1 |
| Red Hat rhel aus 8.4 | libtasn1-tools | 0:4.13-3.el8_4.1 |
| Red Hat rhel aus 8.4 | libtasn1-tools-debuginfo | 0:4.13-3.el8_4.1 |
| Red Hat rhel aus 8.6 | gnutls | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | gnutls-c++ | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | gnutls-c++-debuginfo | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | gnutls-dane | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | gnutls-dane-debuginfo | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | gnutls-debuginfo | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | gnutls-debugsource | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | gnutls-devel | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | gnutls-utils | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | gnutls-utils-debuginfo | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel aus 8.6 | libtasn1 | 0:4.13-3.el8_6.2 |
| Red Hat rhel aus 8.6 | libtasn1-debuginfo | 0:4.13-3.el8_6.2 |
| Red Hat rhel aus 8.6 | libtasn1-debugsource | 0:4.13-3.el8_6.2 |
| Red Hat rhel aus 8.6 | libtasn1-devel | 0:4.13-3.el8_6.2 |
| Red Hat rhel aus 8.6 | libtasn1-tools | 0:4.13-3.el8_6.2 |
| Red Hat rhel aus 8.6 | libtasn1-tools-debuginfo | 0:4.13-3.el8_6.2 |
| Red Hat rhel e4s 8.8 | gnutls | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | gnutls-c++ | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | gnutls-c++-debuginfo | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | gnutls-dane | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | gnutls-dane-debuginfo | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | gnutls-debuginfo | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | gnutls-debugsource | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | gnutls-devel | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | gnutls-utils | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | gnutls-utils-debuginfo | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel e4s 8.8 | libtasn1 | 0:4.13-4.el8_8.1 |
| Red Hat rhel e4s 8.8 | libtasn1-debuginfo | 0:4.13-4.el8_8.1 |
| Red Hat rhel e4s 8.8 | libtasn1-debugsource | 0:4.13-4.el8_8.1 |
| Red Hat rhel e4s 8.8 | libtasn1-devel | 0:4.13-4.el8_8.1 |
| Red Hat rhel e4s 8.8 | libtasn1-tools | 0:4.13-4.el8_8.1 |
| Red Hat rhel e4s 8.8 | libtasn1-tools-debuginfo | 0:4.13-4.el8_8.1 |
| Red Hat rhel e4s 9.2 | gnutls | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.2 | gnutls-c++ | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.2 | gnutls-c++-debuginfo | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.2 | gnutls-dane | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.2 | gnutls-dane-debuginfo | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.2 | gnutls-debuginfo | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.2 | gnutls-debugsource | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.2 | gnutls-devel | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.2 | gnutls-utils | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.2 | gnutls-utils-debuginfo | 0:3.7.6-21.el9_2.7 |
| Red Hat rhel e4s 9.4 | gnutls | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel e4s 9.4 | gnutls-c++ | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel e4s 9.4 | gnutls-c++-debuginfo | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel e4s 9.4 | gnutls-dane | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel e4s 9.4 | gnutls-dane-debuginfo | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel e4s 9.4 | gnutls-debuginfo | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel e4s 9.4 | gnutls-debugsource | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel e4s 9.4 | gnutls-devel | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel e4s 9.4 | gnutls-utils | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel e4s 9.4 | gnutls-utils-debuginfo | 0:3.8.3-4.el9_4.6 |
| Red Hat rhel els 7 | gnutls | 0:3.3.29-9.el7_9.2 |
| Red Hat rhel els 7 | gnutls-c++ | 0:3.3.29-9.el7_9.2 |
| Red Hat rhel els 7 | gnutls-dane | 0:3.3.29-9.el7_9.2 |
| Red Hat rhel els 7 | gnutls-devel | 0:3.3.29-9.el7_9.2 |
| Red Hat rhel els 7 | gnutls-utils | 0:3.3.29-9.el7_9.2 |
| Red Hat rhel eus 9.6 | gnutls | 0:3.8.3-6.el9_6.4 |
| Red Hat rhel eus 9.6 | gnutls-c++ | 0:3.8.3-6.el9_6.4 |
| Red Hat rhel eus 9.6 | gnutls-dane | 0:3.8.3-6.el9_6.4 |
| Red Hat rhel eus 9.6 | gnutls-debuginfo | 0:3.8.3-6.el9_6.4 |
| Red Hat rhel eus 9.6 | gnutls-debugsource | 0:3.8.3-6.el9_6.4 |
| Red Hat rhel eus 9.6 | gnutls-devel | 0:3.8.3-6.el9_6.4 |
| Red Hat rhel eus 9.6 | gnutls-utils | 0:3.8.3-6.el9_6.4 |
| Red Hat rhel eus 9.6 | gnutls-utils-debuginfo | 0:3.8.3-6.el9_6.4 |
| Red Hat rhel eus long life 8.4 | gnutls | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel eus long life 8.4 | gnutls-c++ | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel eus long life 8.4 | gnutls-c++-debuginfo | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel eus long life 8.4 | gnutls-dane | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel eus long life 8.4 | gnutls-dane-debuginfo | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel eus long life 8.4 | gnutls-debuginfo | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel eus long life 8.4 | gnutls-debugsource | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel eus long life 8.4 | gnutls-devel | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel eus long life 8.4 | gnutls-utils | 0:3.6.14-10.el8_4.1 |
| Red Hat rhel eus long life 8.4 | libtasn1 | 0:4.13-3.el8_4.1 |
| Red Hat rhel eus long life 8.4 | libtasn1-debuginfo | 0:4.13-3.el8_4.1 |
| Red Hat rhel eus long life 8.4 | libtasn1-debugsource | 0:4.13-3.el8_4.1 |
| Red Hat rhel eus long life 8.4 | libtasn1-devel | 0:4.13-3.el8_4.1 |
| Red Hat rhel eus long life 8.4 | libtasn1-tools | 0:4.13-3.el8_4.1 |
| Red Hat rhel eus long life 8.4 | libtasn1-tools-debuginfo | 0:4.13-3.el8_4.1 |
| Red Hat rhel eus long life 8.6 | gnutls | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | gnutls-c++ | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | gnutls-c++-debuginfo | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | gnutls-dane | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | gnutls-dane-debuginfo | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | gnutls-debuginfo | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | gnutls-debugsource | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | gnutls-devel | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | gnutls-utils | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | gnutls-utils-debuginfo | 0:3.6.16-5.el8_6.5 |
| Red Hat rhel eus long life 8.6 | libtasn1 | 0:4.13-3.el8_6.2 |
| Red Hat rhel eus long life 8.6 | libtasn1-debuginfo | 0:4.13-3.el8_6.2 |
| Red Hat rhel eus long life 8.6 | libtasn1-debugsource | 0:4.13-3.el8_6.2 |
| Red Hat rhel eus long life 8.6 | libtasn1-devel | 0:4.13-3.el8_6.2 |
| Red Hat rhel eus long life 8.6 | libtasn1-tools | 0:4.13-3.el8_6.2 |
| Red Hat rhel eus long life 8.6 | libtasn1-tools-debuginfo | 0:4.13-3.el8_6.2 |
| Red Hat rhel tus 8.8 | gnutls | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | gnutls-c++ | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | gnutls-c++-debuginfo | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | gnutls-dane | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | gnutls-dane-debuginfo | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | gnutls-debuginfo | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | gnutls-debugsource | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | gnutls-devel | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | gnutls-utils | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | gnutls-utils-debuginfo | 0:3.6.16-7.el8_8.4 |
| Red Hat rhel tus 8.8 | libtasn1 | 0:4.13-4.el8_8.1 |
| Red Hat rhel tus 8.8 | libtasn1-debuginfo | 0:4.13-4.el8_8.1 |
| Red Hat rhel tus 8.8 | libtasn1-debugsource | 0:4.13-4.el8_8.1 |
| Red Hat rhel tus 8.8 | libtasn1-devel | 0:4.13-4.el8_8.1 |
| Red Hat rhel tus 8.8 | libtasn1-tools | 0:4.13-4.el8_8.1 |
| Red Hat rhel tus 8.8 | libtasn1-tools-debuginfo | 0:4.13-4.el8_8.1 |
| Rocky Linux 10 | gnutls | 0:3.8.10-4.el10_2 |
| Rocky Linux 8 | gnutls | 0:3.6.16-8.el8_10.6 |
| Rocky Linux 9 | gnutls | 0:3.8.10-4.el9_8 |
| SUSE Linux Enterprise Micro 5.3 | gnutls | 3.7.3-150400.24.2 |
| Ubuntu 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.9 |
| Ubuntu 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.6 |
| Ubuntu 25.10 | gnutls28 | 3.8.9-3ubuntu2.2 |
| Ubuntu 26.04 LTS | gnutls28 | 3.8.12-2ubuntu1.1 |
| Ubuntu Pro 16.04 LTS | gnutls28 | 3.4.10-4ubuntu1.9+esm4 |
| Ubuntu Pro 18.04 LTS | gnutls28 | 3.5.18-1ubuntu1.6+esm4 |
| Ubuntu Pro 20.04 LTS | gnutls28 | 3.6.13-2ubuntu1.12+esm3 |
| Ubuntu Pro FIPS-preview 22.04 LTS | gnutls28 | no fix |
| Ubuntu Pro FIPS-updates 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.9+Fips1 |
| Ubuntu Pro FIPS-updates 24.04 LTS | gnutls28 | 3.8.3-1.1ubuntu3.6+Fips1.2 |
| openSUSE Tumbleweed | gnutls | 3.8.13-1.1 |