SeaweedFS before 4.34 contains a path traversal vulnerability in the S3 gateway DeleteMultipleObjectsHandler that allows authenticated S3 principals with write access to a single bucket to delete arbitrary objects in other tenants' buckets by supplying object keys containing ../ sequences in the DeleteObjects XML request body. Attackers can bypass authorization controls through a confused deputy condition, as the validateRequestPath middleware only inspects URL-captured path variables and never examines request-body keys, allowing the filer path to collapse directory traversal sequences and resolve deletions outside the authorized bucket.
https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-w62w-66v9-vvgv
https://github.com/seaweedfs/seaweedfs/releases/tag/4.34
https://github.com/seaweedfs/seaweedfs/pull/9931
https://github.com/seaweedfs/seaweedfs/commit/0345658ea8e7c6a3948ad190634b00866ec244c9
Published: 2026-06-30
Updated: 2026-06-30
Base Score: 8.5
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:C
Severity: High
Base Score: 8.1
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Severity: High
Base Score: 7.2
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Severity: High