CVE-2026-32280

HIGH

Unexpected work during chain building in crypto/x509

Title source: cna
STIX 2.1

Description

During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls.

References (157)

Core 157
Core References

Scores

CVSS v3 7.5
EPSS 0.0062
EPSS Percentile 46.0%
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-770
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