CVE-2026-55828

qbee transport: Symlink-chain path traversal in tar extraction (one level outside destination)

State: Published
Severity: 6.0 Medium
Published: Sep 15, 2026
Updated: Sep 15, 2026
Reserved: Jun 17, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	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	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59 Improper Link Resolution Before File Access ('Link Following')

Affected Products

Product	Versions
transportqbee-io	< 1.26.25Affected

References

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