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Large Certificate Chains Cause Slow Certificate Validation in Some Software
GO-2026-4946
CVE-2026-32281
Summary
Certain software that checks digital certificates for trust may take a long time to validate certificates that have many policy mappings. This can cause the software to become unresponsive or slow. If you're using this software, check your certificate validation processes to ensure they're not being slowed down by large certificate chains.
What to do
- Update stdlib to version 1.26.2.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| – | stdlib | > 1.26.0-0 , <= 1.26.2 | 1.26.2 |
Original title
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 ...
Original 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.
Published: 8 Apr 2026 · Updated: 9 Apr 2026 · First seen: 8 Apr 2026