CVE-2026-32280

HIGH 7.5

Unexpected work during chain building in crypto/x509

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	go standard library
Product	crypto/x509
Published	Apr 8, 2026
Last Updated	Apr 8, 2026

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Affected Versions

Go standard library / crypto/x509

0 < 1.25.9 1.26.0-0 < 1.26.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/cl/758320 go.dev: https://go.dev/issue/78282 groups.google.com: https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-4947

Credits

Jakub Ciolek - https://ciolek.dev