medium6.0
CVE-2026-55828
go.qbee.io/transport: Symlink-chain path traversal in tar extraction (one level outside destination)
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | go.qbee.io/transport | < 1.26.25 | 1.26.25 |