rclone serve s3 before 1.74.4 contains a path traversal vulnerability that allows attackers to read and overwrite root-level files by using dot-dot segments in S3 object keys. Attackers can send requests with object keys like ../root-secret.txt to escape the bucket namespace and access files in the serve root directory.
CVE-2026-79781
MEDIUMPre-NVD 6.56.5—Trending — 4 sources updated this weekElevated
EchelonGraph scoreHIGH confidence
Score 6.5 from GitHub Security Advisory published 2026-08-25. a secondary CVSS source baseline 6.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(high)
- EG Risk
- 60(Attend)EG Risk 60/100SSVC: Attend
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity65% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS PROB
- 0%
- EPSS %ILE
- 17%
- KEV
- Not listed
Published
August 25, 2026
Last Modified
August 25, 2026
Advisory Details (2)
Auto-updated Aug 25, 2026🔬 Proof of concept available. Patch available. Sources: github.
generic
rclone serve s3 Path Traversal via dot-dot object keys | Advisories | VulnCheck
https://www.vulncheck.com/advisories/rclone-serve-s3-path-traversal-via-dot-dot-object-keysgithub Patch Available🟡 PoC Available
Path traversal in rclone serve s3 allows reading and overwriting root-level files · Advisory · rclone/rclone · GitHub
https://github.com/rclone/rclone/security/advisories/GHSA-8v25-v8p6-qf7vVendor Advisories for CVE-2026-79781(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
Go(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| github.com/rclone/rclone | — | 1.74.4 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 16× in last 7d / 16× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 17:27 UTCEG score recompute
- 2026-08-29 17:27 UTCGHSA enrichment
- 2026-08-28 21:42 UTCEPSS rescore
- 2026-08-28 17:47 UTCGHSA enrichment
- 2026-08-27 18:11 UTCEG score recompute
- 2026-08-27 18:11 UTCGHSA enrichment
- 2026-08-27 14:25 UTCEPSS rescore
- 2026-08-26 17:56 UTCEG score recompute
- 2026-08-26 17:56 UTCGHSA enrichment
- 2026-08-26 14:47 UTCEPSS rescore
- 2026-08-25 18:28 UTCEG score recompute
- 2026-08-25 17:40 UTCEG score recompute
- 2026-08-25 16:24 UTCEG score recompute
- 2026-08-25 15:30 UTCEG score recompute
- 2026-08-25 15:29 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-79781?
CVE-2026-79781 is a medium vulnerability published on August 25, 2026. rclone serve s3 before 1.74.4 contains a path traversal vulnerability that allows attackers to read and overwrite root-level files by using dot-dot segments in S3 object keys. Attackers can send requests with object keys like ../root-secret.txt to escape the bucket namespace and access files in the…
When was CVE-2026-79781 disclosed?
CVE-2026-79781 was first published in the National Vulnerability Database on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79781 actively exploited?
CVE-2026-79781 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 83.2% of all scored CVEs.
What is the CVSS score of CVE-2026-79781?
CVE-2026-79781 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-79781?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79781, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-79781
Is Your Infrastructure Affected by CVE-2026-79781?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.