CVE-2026-32281

Description

Validating certificate chains which use policies is unexpectedly inefficient when certificates in the chain contain a very large number of policy mappings, possibly causing denial of service. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.

CVSS breakdown

Affected products

• Golang / Go1.25.9
• Go standard library / crypto/x5090 – 1.25.9
• Go standard library / crypto/x5091.26.0-0 – 1.26.2

References

• MISChttps://go.dev/cl/758061
• MISChttps://go.dev/issue/78281
• MISChttps://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
• MISChttps://pkg.go.dev/vuln/GO-2026-4946