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.
Affected products
golang: go
References4
- pkg.go.dev/vuln/GO-2026-4946 Vendor Advisory
- go.dev/cl/758061 Patch
- go.dev/issue/78281 Issue Tracking
- groups.google.com/g/golang-announce/c/0uYbvbPZRWU Issue TrackingRelease Notes
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 30 · as of 12 November 2026
- CWE
- CWE-295
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.