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TI-2026-80207 Aliases CVE-2026-116189GHSA-mhj4-h9x6-3888

Signature verification bypass in rclone selfupdate

Priority HIGH 69CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
High
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-347.

Summary

rclone from 1.55.0 before 1.75.2 trusts checksums from unsigned bytes that precede the PGP-clearsigned SHA256SUMS block in its stable selfupdate. This improper verification of a cryptographic signature (CWE-347) lets an attacker who controls the release distribution path cause selfupdate to install an attacker-controlled rclone executable.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00142 3rd percentileScored 2026-11-07
Fix Partial rclone (rclone): 1.75.2Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
rclonerclone1.55.0 to before 1.75.21.75.2Patch availableCNA
  • rclone Vendorrclone Affected 1.55.0 to before 1.75.2 Fixed in 1.75.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:*1.55.0 to before 1.75.2Vulnerablerclone
  • cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:* Versions 1.55.0 to before 1.75.2 Vulnerable ·rclone

Remediation

Upgrade rclone to version 1.75.2, which fixes this flaw. Red Hat lists Cryostat 4 as affected, with no fix available.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA rclone (rclone) Fixed in 1.75.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    rclone 1.75.2

    9 records Highest priority Priority HIGH 4 HIGH, 2 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-80211 Authentication bypass in rclone serve webdav via OPTIONS requestsPriority HIGH 70
    • TI-2026-80206 Integer overflow in rclone serve s3 lets attackers exhaust memoryPriority HIGH 70
    • TI-2026-80212 Cross-site request forgery in Rclone pCloud OAuth callbackPriority HIGH 68
    Show all 9 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Cryostat 4AffectedNo fix yet
Not affected: 1 product
  • Red Hat Advanced Cluster Management for Kubernetes 2

Timeline

  1. 2026-10-25 Threatist record created from CVE-2026-116189
  2. 2026-10-26 Affected versions changed · Red Hat
  3. 2026-10-26 CVSS score added · Red Hat
  4. 2026-10-26 Priority changed: MEDIUM → LOW
  5. 2026-10-27 Alias added: GHSA-mhj4-h9x6-3888
  6. 2026-10-29 Affected versions changed · Red Hat
  7. 2026-10-29 CISA SSVC decision points changed
  8. 2026-10-29 Priority changed: LOW → HIGH

References

Advisory 1

  • TI-2026-60044 rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass CVSS 3.1CRITICAL 9.8
  • TI-2026-29802 RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution CVSS 4.0CRITICAL 9.2
  • TI-2026-29799 Rclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command execution CVSS 4.0CRITICAL 9.2
  • TI-2026-42602 Path traversal in rclone CVSS 3.1HIGH 8.8
  • TI-2026-39407 rclone: Unvalidated symlink target in local `--links` — arbitrary file write from an untrusted remote CVSS 3.1HIGH 8.8
  • TI-2026-80211 Authentication bypass in rclone serve webdav via OPTIONS requests CVSS 4.0MEDIUM 6.9
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences