CVE-2026-111943: Distrust compromised intermediate certificates in crypto/x509

Analysis on rafaelpfister.ch

Article · November 11, 2026 Rclone 1.76.0: numerous security fixes, VFS fixes, and new backends Rclone 1.76.0, released on November 6, 2026, closes security vulnerabilities in serve, rc, and several backends, including an auth-proxy vulnerability in serve sftp with CVSS 8.1, fixes five bugs in the VFS layer, and blocks HTTPS-to-HTTP redirects by default. Operators of mounts, serve services, and rc should update and review the changed defaults.

Vendor description

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.

Reference data

Vendor

Go standard library

Affected products

crypto/x509

CVSS 3.1

6.8 (MEDIUM)

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Weakness type

CWE-299: Improper Check for Certificate Revocation

Published

October 21, 2026

Official sources

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