What’s Vulnerable › Vulnerabilities

CVE-2026-55828: qbee transport: Symlink-chain path traversal in tar extraction (one level outside destination)

• Severity: medium (CVSS 6.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-30
• Weakness: CWE-22

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.

Affected products

• qbee-io transport: before 1.26.25

References

• 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

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