qbee-io/transport · Security
go.qbee.io/transport: Symlink-chain path traversal in tar extraction (one level outside destination)
- GHSA ID
- GHSA-f9m7-vc86-p6jj
- CVE ID
- CVE-2026-55828
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6 · CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Description
Impact
The go.qbee.io/transport library is affected by a symlink-chain path traversal vulnerability in its extractTar routine. The library's path validation is strictly lexical and fails to account for on-disk symlinks created earlier in the extraction process. Consequently, a crafted tar archive can be used to write or overwrite files one directory level above the intended extraction path. In the case of qbee-agent, which runs with root privileges, this vulnerability permits a root-privileged file write outside the intended destination.
Patches
The issue has been addressed in version v1.26.25
CWEs
- CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CWE-59 · Improper Link Resolution Before File Access ('Link Following')