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TI-2026-80214 Aliases CVE-2026-116196GHSA-fq8p-rg92-hj4q

Rclone B2 backend leaks credentials on HTTP redirects

Priority LOW 25CWE-319Published · 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-319.

Summary

Rclone before v1.75.2 exposes sensitive data in its b2 backend when it follows HTTP redirects from --b2-download-url hosts. The client sends the live B2 account Authorization token and SSE-C encryption keys on these redirects, including downgrades from HTTPS to cleartext HTTP (CWE-319). An attacker on the adjacent network who observes such a redirect can capture the token, though the attack is high complexity and needs no privileges or user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

Rclone before v1.75.2 contains a credential exposure vulnerability in the b2 backend that leaks the live account Authorization token and SSE-C keys on HTTP redirects from --b2-download-url hosts. Attackers can observe a same-host HTTPS-to-HTTP downgrade redirect to capture the cleartext B2 token, or receive cross-host redirects disclosing SSE-C customer encryption keys.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00063 0th percentileScored 2026-11-07
Fix Partial rclone (rclone): 1.75.2Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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 1.75.21.75.2Patch availableCNA
  • rclone Vendorrclone Affected before 1.75.2 Fixed in 1.75.2 Patch available CNA

CPE configurations NVD · 1

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

Remediation

Upgrade Rclone to version 1.75.2 or later. Red Hat lists Cryostat 4 and Red Hat Advanced Cluster Management for Kubernetes 2 as affected without a fix and with no plan available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • 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-2026-80207 Signature verification bypass in rclone selfupdatePriority HIGH 69
    Show all 9 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. 2026-10-25 Threatist record created from CVE-2026-116196
  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-fq8p-rg92-hj4q
  6. 2026-11-04 CISA SSVC decision points changed

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