GHSA-8v25-v8p6-qf7v: github.com/rclone/rclone (CVE-2026-79781)

Package	Ecosystem	Affected	Fixed in
github.com/rclone/rclone	Go	<1.74.4	1.74.4

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Rclone versions before 1.74.4 are affected by a path traversal flaw in rclone serve s3: dot-dot segments in object keys are normalized, letting a request read or overwrite files at the root of the serve directory outside the requested bucket. An attacker who can reach the endpoint can exploit this, and it is more exposed when no --auth-key is configured, since anonymous access is then allowed. Upgrade to rclone 1.74.4, which contains the fix.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.9	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0030, the 23rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:13 UTC First seen by agentprime
31 Oct 2026, 14:13 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.