CVE-2026-27137
Incorrect enforcement of email constraints in crypto/x509
CVE-2026-27137 is fixed in 24 products on 2 platforms, first by Go Programming Language 1.26.1, released March 5, 2026. It is not reported as exploited. Patch Radar priority: High.
HighFixed on 2 platforms
CVSS
9.1
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0066
51st percentile
When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Go Programming Language | 1.26.1 | Go Programming Language 1.26.1 | Mar 5, 2026 |
| Linux | |||
| delve · RHEL 10 | 1.26.1-1.el10_0 | RHSA-2026:49703 | Apr 30, 2026 |
| delve · almalinux 10 | 1.25.2-3.el10_1 | ALSA-2026:8842 | Apr 20, 2026 |
| delve · ol 10 | 0:1.25.2-3.0.1.el10_1 | ELSA-2026-8842 | Apr 20, 2026 |
| delve · rocky 10 | 0:1.25.2-3.el10_1 | RLSA-2026:8842 | Apr 21, 2026 |
| flightctl · RHEL 10 | 1.1.3-1.el10em | RHSA-2026:41019 | May 22, 2026 |
| go-toolset · RHEL 9 | 0:1.26.2-1.el9_8 | RHSA-2026:19181 | May 27, 2026 |
| go-toolset · almalinux 10 | 1.26.2-2.el10_2.alma.1 | ALSA-2026:19022 | May 19, 2026 |
| go-toolset · almalinux 9 | 1.26.2-1.el9_8 | ALSA-2026:19181 | May 19, 2026 |
| go-toolset · ol 10 | 0:1.26.2-2.0.1.el10_2 | ELSA-2026-19022 | Jul 8, 2026 |
| go-toolset · ol 9 | 0:1.26.2-1.0.1.el9_8 | ELSA-2026-19181 | Jun 12, 2026 |
| go1.26 · opensuse-leap 15.6 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 | Mar 11, 2026 |
| go1.26 · opensuse-leap 16.0 | 1.26.1-160000.1.1 | OPENSUSE-SU-2026:20342-1 | Mar 11, 2026 |
| go1.26 · sles 15.6 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 | Mar 11, 2026 |
| go1.26 · sles 15.7 | 1.26.1-150000.1.6.1 | SUSE-SU-2026:0876-1 | Mar 11, 2026 |
| go1.26-openssl · opensuse-leap 15.6 | 1.26.1-150600.13.3.1 | SUSE-SU-2026:0976-1 | Mar 23, 2026 |
| go1.26-openssl · opensuse-leap 16.0 | 1.26.1-160000.1.1 | OPENSUSE-SU-2026:20537-1 | Apr 14, 2026 |
| go1.26-openssl · sles 15.6 | 1.26.1-150600.13.3.1 | SUSE-SU-2026:0976-1 | Mar 23, 2026 |
| go1.26-openssl · sles 15.7 | 1.26.1-150600.13.3.1 | SUSE-SU-2026:0976-1 | Mar 23, 2026 |
| go1.26-openssl · sles 16.0 | 1.26.1-160000.1.1 | SUSE-SU-2026:21195-1 | Apr 14, 2026 |
| golang · RHEL 10 | 1.26.5-1.el10_0 | RHSA-2026:49702 | May 27, 2026 |
| golang · RHEL 9 | 0:1.26.2-1.el9_8 | RHSA-2026:19181 | May 27, 2026 |
| golang · almalinux 10 | 1.26.2-2.el10_2.alma.1 | ALSA-2026:19022 | May 19, 2026 |
| golang · almalinux 9 | 1.26.2-1.el9_8 | ALSA-2026:19181 | May 19, 2026 |
| golang · ol 10 | 0:1.26.2-2.0.1.el10_2 | ELSA-2026-19022 | Jul 8, 2026 |
| golang · ol 9 | 0:1.26.2-1.0.1.el9_8 | ELSA-2026-19181 | Jun 12, 2026 |
| golang · rocky 10 | 0:1.26.2-2.el10_2 | RLSA-2026:19022 | May 29, 2026 |
| golang · rocky 9 | 0:1.26.2-1.el9_8 | RLSA-2026:19181 | May 28, 2026 |
| golang-1.26 · Debian 14 | 1.26.1-1 | DEBIAN-CVE-2026-27137 | Mar 6, 2026 |
| golang-bin · RHEL 9 | 0:1.26.2-1.el9_8 | RHSA-2026:19181 | May 27, 2026 |
| golang-bin · almalinux 10 | 1.26.2-2.el10_2.alma.1 | ALSA-2026:19022 | May 19, 2026 |
| golang-bin · almalinux 9 | 1.26.2-1.el9_8 | ALSA-2026:19181 | May 19, 2026 |
| golang-bin · ol 10 | 0:1.26.2-2.0.1.el10_2 | ELSA-2026-19022 | Jul 8, 2026 |
| golang-bin · ol 9 | 0:1.26.2-1.0.1.el9_8 | ELSA-2026-19181 | Jun 12, 2026 |
| golang-docs · RHEL 9 | 0:1.26.2-1.el9_8 | RHSA-2026:19181 | May 27, 2026 |
| golang-docs · almalinux 10 | 1.26.2-2.el10_2.alma.1 | ALSA-2026:19022 | May 19, 2026 |
| golang-docs · almalinux 9 | 1.26.2-1.el9_8 | ALSA-2026:19181 | May 19, 2026 |
| golang-docs · ol 10 | 0:1.26.2-2.0.1.el10_2 | ELSA-2026-19022 | Jul 8, 2026 |
| golang-docs · ol 9 | 0:1.26.2-1.0.1.el9_8 | ELSA-2026-19181 | Jun 12, 2026 |
| golang-github-openprinting-ipp-usb · RHEL 10 | 0.9.27-6.el10_2 | RHSA-2026:19049 | Mar 6, 2026 |
| golang-misc · RHEL 9 | 0:1.26.2-1.el9_8 | RHSA-2026:19181 | May 27, 2026 |
| golang-misc · almalinux 10 | 1.26.2-2.el10_2.alma.1 | ALSA-2026:19022 | May 19, 2026 |
| golang-misc · almalinux 9 | 1.26.2-1.el9_8 | ALSA-2026:19181 | May 19, 2026 |
| golang-misc · ol 10 | 0:1.26.2-2.0.1.el10_2 | ELSA-2026-19022 | Jul 8, 2026 |
| golang-misc · ol 9 | 0:1.26.2-1.0.1.el9_8 | ELSA-2026-19181 | Jun 12, 2026 |
| golang-race · RHEL 9 | 0:1.26.2-1.el9_8 | RHSA-2026:19181 | May 27, 2026 |
| golang-race · almalinux 10 | 1.26.2-2.el10_2.alma.1 | ALSA-2026:19022 | May 19, 2026 |
| golang-race · almalinux 9 | 1.26.2-1.el9_8 | ALSA-2026:19181 | May 19, 2026 |
| golang-race · ol 10 | 0:1.26.2-2.0.1.el10_2 | ELSA-2026-19022 | Jul 8, 2026 |
| golang-race · ol 9 | 0:1.26.2-1.0.1.el9_8 | ELSA-2026-19181 | Jun 12, 2026 |
| golang-src · RHEL 9 | 0:1.26.2-1.el9_8 | RHSA-2026:19181 | May 27, 2026 |
| golang-src · almalinux 10 | 1.26.2-2.el10_2.alma.1 | ALSA-2026:19022 | May 19, 2026 |
| golang-src · almalinux 9 | 1.26.2-1.el9_8 | ALSA-2026:19181 | May 19, 2026 |
| golang-src · ol 10 | 0:1.26.2-2.0.1.el10_2 | ELSA-2026-19022 | Jul 8, 2026 |
| golang-src · ol 9 | 0:1.26.2-1.0.1.el9_8 | ELSA-2026-19181 | Jun 12, 2026 |
| golang-tests · RHEL 9 | 0:1.26.2-1.el9_8 | RHSA-2026:19181 | May 27, 2026 |
| golang-tests · almalinux 10 | 1.26.2-2.el10_2.alma.1 | ALSA-2026:19022 | May 19, 2026 |
| golang-tests · almalinux 9 | 1.26.2-1.el9_8 | ALSA-2026:19181 | May 19, 2026 |
| golang-tests · ol 10 | 0:1.26.2-2.0.1.el10_2 | ELSA-2026-19022 | Jul 8, 2026 |
| golang-tests · ol 9 | 0:1.26.2-1.0.1.el9_8 | ELSA-2026-19181 | Jun 12, 2026 |
| govulncheck-vulndb · opensuse-leap 15.6 | 0.0.20260317T205859-150000.1.152.1 | SUSE-SU-2026:1042-1 | Mar 25, 2026 |
| govulncheck-vulndb · opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | OPENSUSE-SU-2026:21483-1 | Jul 30, 2026 |
| grafana · RHEL 10 | 10.2.6-26.el10_0 | RHSA-2026:67517 | Jul 6, 2026 |
| grafana-pcp · RHEL 10 | 5.3.0-1.el10_0 | RHSA-2026:56143 | Jun 2, 2026 |
| image-builder · RHEL 10 | 52.1-1.el10_2 | RHSA-2026:22937 | Mar 12, 2026 |
| image-builder · RHEL 9 | 0:52.1-1.el9_8 | RHSA-2026:23228 | May 15, 2026 |
| image-builder · ol 10 | 0:58-1.0.1.el10 | ELSA-2026-22937 | Jul 16, 2026 |
| image-builder · ol 9 | 0:72.0.0-1.0.1.el9 | ELSA-2026-23228 | Sep 3, 2026 |
| image-builder · rocky 10 | 0:52.1-1.el10_2.rocky.0.1 | RLSA-2026:22937 | Jun 5, 2026 |
| image-builder · rocky 9 | 0:52.1-1.el9_8 | RLSA-2026:23228 | Jun 5, 2026 |
| ipp-usb · ol 10 | 0:0.9.27-6.el10_2 | ELSA-2026-19049 | Jul 8, 2026 |
| osbuild-composer · RHEL 10 | 165.1-2.el10_2 | RHSA-2026:22450 | Mar 12, 2026 |
| osbuild-composer · RHEL 9 | 0:165.1-2.el9_8 | RHSA-2026:22714 | Jun 24, 2026 |
| osbuild-composer · ol 10 | 0:176-1.0.1.el10_2 | ELSA-2026-22450 | Aug 13, 2026 |
| osbuild-composer · ol 9 | 0:175-1.0.1.el9_8 | ELSA-2026-22714 | Aug 5, 2026 |
| osbuild-composer · rocky 10 | 0:165.1-2.el10_2.rocky.0.1 | RLSA-2026:22450 | Jun 5, 2026 |
| osbuild-composer · rocky 9 | 0:165.1-2.el9_8.rocky.0.1 | RLSA-2026:22714 | Jun 11, 2026 |
| osbuild-composer-core · RHEL 9 | 0:165.1-2.el9_8 | RHSA-2026:22714 | Jun 24, 2026 |
| osbuild-composer-core · ol 10 | 0:176-1.0.1.el10_2 | ELSA-2026-22450 | Aug 13, 2026 |
| osbuild-composer-core · ol 9 | 0:175-1.0.1.el9_8 | ELSA-2026-22714 | Aug 5, 2026 |
| osbuild-composer-worker · RHEL 9 | 0:165.1-2.el9_8 | RHSA-2026:22714 | Jun 24, 2026 |
| osbuild-composer-worker · ol 10 | 0:176-1.0.1.el10_2 | ELSA-2026-22450 | Aug 13, 2026 |
| osbuild-composer-worker · ol 9 | 0:175-1.0.1.el9_8 | ELSA-2026-22714 | Aug 5, 2026 |
| rhc-worker-playbook · RHEL 10 | 0.2.3-4.el10_0 | RHSA-2026:10929 | Mar 6, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.