CVE-2026-32281: DoS via Policy Map Ineff in Go crypto/x509 <1.25.9, <1.26.2
CVE-2026-32281 Published on April 8, 2026
Inefficient policy validation in crypto/x509
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.
Vulnerability Analysis
CVE-2026-32281 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Products Associated with CVE-2026-32281
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Affected Versions
Go standard library crypto/x509:- Before 1.25.9 is affected.
- Version 1.26.0-0 and below 1.26.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.