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.
Scores
CVSS v3
7.5
EPSS
0.0002
EPSS Percentile
4.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-295
Status
published
Products (3)
Go standard library/crypto/x509
< 1.25.9
Go standard library/crypto/x509
1.26.0-0 - 1.26.2
golang/go
< 1.25.9
Published
Apr 08, 2026
Tracked Since
Apr 08, 2026