CVE-2026-109118: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in rdiffweb

Severity: medium (CVSS 4.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-16 · updated 2026-10-16
Weakness: CWE-22

Description

Improper path containment check in ikus060 rdiffweb 7.1.1 allows an authenticated user to cause the browse, restore, history and delete operations to resolve to a path outside the repository being operated on, via a percent-encoded traversal sequence (%2e%2e) in the request path, because the containment check uses a string prefix comparison (startswith) instead of a filesystem path boundary check. The target must be a sibling path whose name begins with the repository path, and the user already hold permissions on it; the issue can mislead a user into operating on, or deleting, data other than the repository displayed

Affected products

ikus060/rdiffweb: before 7.1.1 — fixed in 7.1.1

How to fix

Upgrade to a fixed version: ikus060/rdiffweb 7.1.1. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-109118 or the next vulnerability affects your stack