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.

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.

Affected products

Rclone

Weakness classification (CWE)

CWE-319 — Cleartext Transmission of Sensitive Information

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (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.