CVE-2026-32280

HIGH7.5EPSS 0.02%

Unexpected work during chain building in crypto/x509

Published: 4/7/2026Modified: 6/2/2026

Also known as:RHSA-2026:17287 RHSA-2026:19634 RHSA-2026:20607 RHSA-2026:20608 RHSA-2026:20609 RHSA-2026:22130BIT-golang-2026-32280CGA-crmm-287q-6v8jGO-2026-4947

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.

Affected packages (7)

Bitnami/golangfrom 0, < 1.25.9, >= 1.26.0-0, < 1.26.2
Debian/golang-1.15from 0
Debian/golang-1.19from 0
Debian/golang-1.24from 0
Debian/golang-1.25from 0, < 1.25.9-1
Debian/golang-1.26from 0, < 1.26.2-1
Go/stdlibfrom 0, < 1.25.9, >= 1.26.0-0, < 1.26.2

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References (6)

ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-32280
PATCHhttps://go.dev/cl/758320
REPORThttps://go.dev/issue/78282
WEBhttps://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
WEBhttps://nvd.nist.gov/vuln/detail/CVE-2026-32280
WEBhttps://pkg.go.dev/vuln/GO-2026-4947