---
id: CVE-2026-55828
title: qbee transport is a remote access transport protocol implementation
summary: >-
  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 c…
severity: medium
cvss: 6
cvssVector: '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
vendor: qbee-io
product: transport
affected:
  - transport < 1.26.25
patched:
  - go.qbee.io/transport 1.26.25
published: '2026-09-15'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T19:17:22.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55828'
references:
  - url: >-
      https://github.com/qbee-io/transport/commit/43947671ba9be8fb08b105f3539a112ee7a57ddc
    label: security-advisories@github.com
  - url: 'https://github.com/qbee-io/transport/pull/19'
    label: security-advisories@github.com
  - url: >-
      https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-f9m7-vc86-p6jj'
tags:
  - nvd
  - cve.org
  - ghsa
  - go
ecosystem: go
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T17:38:19.351851Z'
cvssSource: cna
ingestedAt: '2026-06-22T13:35:24.352Z'
epss: 0.00369
epssPercentile: 0.30765
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55828)

Affected packages:

- `go.qbee.io/transport < 1.26.25`

Patched in:

- `go.qbee.io/transport 1.26.25`

Source: https://github.com/advisories/GHSA-f9m7-vc86-p6jj