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9.4

rclone may install malicious version during self‑update

CVE-2026-116189 · published 6 days ago
Summary

Versions of rclone from 1.55.0 up to 1.75.1 can be tricked into accepting a fake update. If an attacker can modify the files that rclone downloads for updates, they can cause the program to replace itself with a malicious copy. Update to rclone 1.75.2 or later, and ensure the update source is trusted.

What to do
  • Update rclone to version 1.75.2.
  • Update rclone rclone to version 1.75.2 or later.
Affected software
Ecosystem VendorProductAffected versions
– rclone rclone < 1.75.2
>= 1.55.0, < 1.75.2
Debian:12 debian rclone All versions
Bitnami – rclone >= 1.55.0, < 1.75.2
Fix: upgrade to 1.75.2
Original advisory text
rclone 1.55.0 before 1.75.2 selfupdate Signature Verification Bypass via SHA256SUMS
rclone from 1.55.0 before 1.75.2 contains a signature verification bypass in stable selfupdate that trusts checksums from unsigned bytes preceding the PGP-clearsigned SHA256SUMS block. Attackers controlling the release distribution path can prepend an unsigned checksum line matching a malicious archive, causing selfupdate to install an attacker-controlled rclone executable.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.4 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-347Improper Verification of Cryptographic Signature
Timeline
Published25 Oct 2026
Updated31 Oct 2026
First seen25 Oct 2026
Sources
CVE-2026-116189 · NVD
CVE-2026-116189 · MITRE
DEBIAN-CVE-2026-116189 · OSV
CVE-2026-116189 · OSV
GHSA-w33h-3qgq-8mv8 · GHSA
BIT-rclone-2026-116189 · OSV
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