Vulnerability in Go standard library crypto/x509

[ Why it matters ]Priority signals

• Interim mitigation published by PrivacySafe

[ Description ]Official description

On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action. To defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy.

[ Fixes ]Fixes and patches

• eMudhra CA CompromiseInterim mitigation · PrivacySafe · Interim mitigation for System CA store on Debian/Ubuntu/Trisquel and derivatives

[ Advisories ]Government CERT advisories

• BSI CERT-Bund19 Oct 2026WID-SEC-2026-4049

  Golang Go: Vulnerability allows bypassing security measures Translated from German

  Risk highCVE-2026-111943

[ References ]References

• go.dev/cl/851047
• go.dev/issue/82345
• groups.google.com/g/golang-announce/c/66pojueaQek
• pkg.go.dev/vuln/GO-2026-6809
• www.openwall.com/lists/oss-security/2026/10/20/29