What is CVE-2026-79779?

CVE-2026-79779 is a medium-severity vulnerability in Rclone, classified under Cleartext Transmission of Sensitive Information. CVSS score: 5.3/10. Published 2026-08-25.

How severe is CVE-2026-79779?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Rclone

CVE-2026-79779

rclone versions before v1.75.0 fail to reject transport downgrades in redirect handling, allowing Basic authorization and Cookie headers to be replayed over plaintext HTTP after same-host HTTPS-to-HTTP redirects. An on-path attacker observing the plaintext hop can capture and reuse credentials to perform WebDAV operations with the compromised account's permissions.

Published 2026-08-25 · last modified 2026-09-10.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (1.1th percentile), scored 2026-10-10.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Rclone

Weakness classification (CWE)

CWE-319 — Cleartext Transmission of Sensitive Information

References

github.com/rclone/rclone/security/advisories/GHSA-h4mf-4v27-hggj (vendor-advisory)
www.vulncheck.com/advisories/rclone-before-webdav-credential-exposure-via-https… (third-party-advisory)

Frequently asked questions

What is CVE-2026-79779?: CVE-2026-79779 is a medium-severity vulnerability in Rclone, classified under Cleartext Transmission of Sensitive Information. CVSS score: 5.3/10. Published 2026-08-25.
How severe is CVE-2026-79779?: Medium severity. CVSS v3 base score is 5.3 out of 10.