---
id: CVE-2026-111943
title: Distrust compromised intermediate certificates in crypto/x509
summary: >-
  On most platforms, Go uses the given system root certificates. However, in
  some narrower cases, the system trust stores may not be updated without
  further action. To defend against the narrower set of cases that may remain
  affected, a de…
severity: none
cwe:
  - CWE-299
vendor: Go standard library
product: crypto/x509
affected:
  - crypto/x509 < 1.26.10
  - crypto/x509 >= 1.27.0-0 < 1.27.3
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T01:24:20.498Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111943'
references:
  - url: 'https://go.dev/cl/851047'
  - url: 'https://go.dev/issue/82345'
  - url: 'https://groups.google.com/g/golang-announce/c/66pojueaQek'
  - url: 'https://pkg.go.dev/vuln/GO-2026-6809'
tags:
  - cve.org
ingestedAt: '2026-10-21T01:37:07.998Z'
---

## Overview

On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action. To defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy.

## Affected

- `crypto/x509 < 1.26.10`
- `crypto/x509 >= 1.27.0-0 < 1.27.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.