CVE-2026-55828 — qbee transport: Symlink-chain path traversal in tar extraction (one level outside destination)
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-…
Published: 2026-09-15 · CVSS: 6.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7