CVE-2026-55828

qbee transport is a remote access transport protocol implementation. Prior to 1.26.25, the extractTar routine uses strictly lexical path validation that does not account for on-disk symlinks created earlier in the extraction process. A crafted tar archive can use a symlink chain to write or overwrite files one directory level above the intended extraction path. When qbee-agent performs the extraction with root privileges, this permits a root-privileged file write outside the intended destination. This issue is fixed in version 1.26.25.

• https://github.com/qbee-io/transport/commit/43947671ba9be8fb08b105f3539a112ee7a57ddc
• https://github.com/qbee-io/transport/pull/19
• https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj