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GO-2026-4946

Inefficient policy validation in crypto/x509

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

Go / stdlib

Introduced in: 0 Fixed in: 1.25.9

Fix go get stdlib@v1.25.9

References

https://go.dev/cl/758061 [FIX]
https://go.dev/issue/78281 [REPORT]
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU [WEB]