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CVE-2026-55828

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

MEDIUM
6
CVSS Score
Published: September 15, 2026 at 03:14 PM UTC
Updated: September 30, 2026 at 05:51 PM UTC
1 product affected across 1 vendorTransport

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Severity
MEDIUM6
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Transport· Qbee Io
60%
v < 1.26.25
Affected range stops below 1.26.25, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM
Source: cverecord
https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj
x_refsource_MISC
Source: cverecord
https://github.com/qbee-io/transport/pull/19
x_refsource_MISC
Source: cverecord
https://github.com/qbee-io/transport/commit/43947671ba9be8fb08b105f3539a112ee7a57ddc

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-22CWE-59

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