EUVD-2026-20008CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4Tags
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.
Analysis
Denial of service in Go's crypto/x509 chain builder allows remote attackers to exhaust server resources by submitting a large number of intermediate certificates during TLS handshake or direct certificate verification. Affects crypto/x509 versions prior to 1.25.9 and 1.26.0-1.26.1. …
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Remediation
Within 24 hours: Identify all Go applications and services using crypto/x509 versions prior to 1.25.9 or 1.26.0-1.26.1 via dependency scanning and version audits. Within 7 days: Upgrade Go runtime to 1.25.9, 1.26.2 or later for all affected applications; verify upgrades in staging environment first. …
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