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TI-2026-55257 Aliases CVE-2026-79780GHSA-fj78-v5f5-cphq

rclone before v1.75.0 Credential Exposure via S3 Redirect

Priority MEDIUM 60CWE-200Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-200.

Summary

rclone before v1.75.0 fails to sanitize IBM IAM bearer tokens and SSE-C encryption keys during S3 redirect callbacks, allowing credentials to be preserved across scheme or host changes. Attackers observing network traffic from a trusted endpoint can capture reusable IBM IAM tokens on same-host HTTPS-to-HTTP downgrades or SSE-C keys on cross-origin redirects to access protected S3 objects.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00147 3rd percentileScored 2026-11-07
Fix Partial rclone (rclone): 1.75.0Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
rclonerclonebefore 1.75.01.75.0Patch availableCNA
  • rclone Vendorrclone Affected before 1.75.0 Fixed in 1.75.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:*——rclone
  • cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:* Versions — — ·rclone

Remediation

  • Fix · CNA rclone (rclone) Fixed in 1.75.0

Fixed in the same release

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

  • Release ·

    rclone 1.75.0

    5 records Highest priority Priority HIGH 1 HIGH, 3 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-55253 rclone before 1.75.0 Authentication Bypass via pprofPriority HIGH 70
    • TI-2026-55255 rclone before v1.75.0 Denial of Service via TUS nil-response panicPriority MEDIUM 60
    • TI-2026-55254 rclone before v1.75.0 Information Disclosure via RC APIPriority MEDIUM 56
    Show all 5 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Cryostat 4AffectedNo fix yet: Fix deferred
Red Hat Advanced Cluster Management for Kubernetes 2AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-79780
  2. 2026-10-03 Alias added: GHSA-fj78-v5f5-cphq

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-2026-60064 rclone: RC per-server auth-proxy bypass CVSS 3.1CRITICAL 9.1
  • TI-2026-42602 Path traversal in rclone CVSS 3.1HIGH 8.8
  • TI-2026-60065 rclone: S3 multipart declared-length memory exhaustion CVSS 3.1HIGH 7.5
See all 43 →

Sources

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