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

Medium severityCVE-2026-55828GHSA-F9M7-VC86-P6JJ

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

Answer in brief

CVE-2026-55828 records a Medium severity vulnerability in qbee transport: Symlink-chain path traversal in tar extraction (one level outside destination). The current sources do not mark it as known exploited. The current feed maps qbee-io/transport (generic), go.qbee.io/transport (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 15, 2026Source checked Sep 15, 2026First seen by HOL Jun 19, 2026Material review Sep 15, 2026

Upstream Advisory

Key facts

Risk: Medium
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps qbee-io/transport (generic), go.qbee.io/transport (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
qbee-io/transportgeneric	< 1.26.25	Not reported
go.qbee.io/transportgo	<1.26.25	1.26.25

Recommended response

Check inventory. Check lockfiles and deployed manifests for qbee-io/transport, go.qbee.io/transport.
Review the reported fix. Update go.qbee.io/transport to 1.26.25 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 19, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.