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PatchSiren cyber security CVE debrief

CVE-2026-79782 rclone CVE debrief

rclone before 1.74.4 fails to strip the X-Amz-Security-Token header when an S3 redirect changes scheme from HTTPS to HTTP on the same host. Attackers can intercept plaintext HTTP traffic to capture AWS STS session tokens sent in request headers. This vulnerability allows for potential unauthorized access to AWS resources and impacts cloud security and access control. Defenders should assess exposure and prioritize patching or mitigation efforts. The CVE record and NVD entry provide details, but verification is needed to confirm affected versions and environments.

Vendor
rclone
Product
Unknown
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-25
Original CVE updated
2026-09-10
Advisory published
2026-08-25
Advisory updated
2026-09-10

Who should care

Defenders responsible for rclone deployments, cloud security teams, and AWS users should assess exposure and prioritize patching or mitigation efforts.

Why it matters

CVE-2026-79782 allows attackers to capture AWS STS session tokens in rclone before 1.74.4, impacting cloud security and access control.

  • Capture of AWS STS session tokens
  • Potential for unauthorized access to AWS resources
  • Need for verification of rclone versions and configurations
  • Priority for applying patches or mitigations

Technical summary

The rclone tool before version 1.74.4 does not properly strip the X-Amz-Security-Token header during S3 redirects from HTTPS to HTTP on the same host. This vulnerability allows attackers to intercept plaintext HTTP traffic and capture AWS STS session tokens sent in request headers.

Defensive priority

Defenders should prioritize verifying rclone versions and configurations, assessing exposure in their environments, and applying patches or mitigations as needed.

Recommended defensive actions

  • Verify rclone versions and configurations to assess exposure
  • Apply patches or mitigations as needed
  • Monitor for suspicious activity in environments using rclone

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional verification is needed to confirm affected versions and environments.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-79782 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-79782

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-79782 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-79782

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.