Improper Certificate Validation Affecting std/crypto/x509 package, versions >=1.26.0-0 <1.26.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-STDCRYPTOX509-15440730
- published9 Mar 2026
- disclosed6 Mar 2026
- creditJakub Ciolek
Introduced: 6 Mar 2026
CVE-2026-27137 (opens in a new tab)How to fix?
Upgrade std/crypto/x509 to version 1.26.1 or higher.
Overview
std/crypto/x509 is a Go standard library package std/crypto/x509
Affected versions of this package are vulnerable to Improper Certificate Validation.
Go Vulnerability Report:
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.