# CVE-2026-55828

## Summary

- **CVE ID:** CVE-2026-55828
- **Severity:** MEDIUM
- **CVSS Score:** 6 (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)
- **CWE:** CWE-22, CWE-59
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 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.

## Affected Products

- qbee-io — transport (< 1.26.25)

## References

- [CNA](https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj)
- [CNA](https://github.com/qbee-io/transport/pull/19)
- [CNA](https://github.com/qbee-io/transport/commit/43947671ba9be8fb08b105f3539a112ee7a57ddc)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.37%
- **EPSS Percentile:** 30.6

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._