CVE-2026-27137
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.61% probability · 47th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-295
- Affected
- golang/go
- Source
- security@golang.org
References
- https://go.dev/cl/752182Mailing List
- https://go.dev/issue/77952Issue Tracking
- https://groups.google.com/g/golang-announce/c/EdhZqrQ98hkRelease Notes
- https://pkg.go.dev/vuln/GO-2026-4599Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:10125
- https://access.redhat.com/errata/RHSA-2026:10158
- https://access.redhat.com/errata/RHSA-2026:10169
- https://access.redhat.com/errata/RHSA-2026:10175
- https://access.redhat.com/errata/RHSA-2026:10184
- https://access.redhat.com/errata/RHSA-2026:10225
- https://access.redhat.com/errata/RHSA-2026:10250
- https://access.redhat.com/errata/RHSA-2026:10929
- https://access.redhat.com/errata/RHSA-2026:11800
- https://access.redhat.com/errata/RHSA-2026:13545
- https://access.redhat.com/errata/RHSA-2026:14879
- https://access.redhat.com/errata/RHSA-2026:19022
- https://access.redhat.com/errata/RHSA-2026:19049
- https://access.redhat.com/errata/RHSA-2026:19132
- https://access.redhat.com/errata/RHSA-2026:19181
- https://access.redhat.com/errata/RHSA-2026:19375
- https://access.redhat.com/errata/RHSA-2026:21769
- https://access.redhat.com/errata/RHSA-2026:22347
- https://access.redhat.com/errata/RHSA-2026:22423
- https://access.redhat.com/errata/RHSA-2026:22450
- https://access.redhat.com/errata/RHSA-2026:22714
- https://access.redhat.com/errata/RHSA-2026:22862
- https://access.redhat.com/errata/RHSA-2026:22937
- https://access.redhat.com/errata/RHSA-2026:23228
- https://access.redhat.com/errata/RHSA-2026:23345
- https://access.redhat.com/errata/RHSA-2026:26568
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.