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TI-2026-40296 Aliases CVE-2026-55828GHSA-f9m7-vc86-p6jj

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

Priority LOW 27CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00375 31st percentileScored 2026-11-07
Fix Fixed transport (qbee-io): 1.26.25go.qbee.io/transport (Go): 1.26.25

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
qbee-iotransportbefore 1.26.251.26.25Patch availableCNA
—go.qbee.io/transport (Go)before 1.26.251.26.25Patch availableGHSA-f9m7-vc86-p6jj
  • transport Vendorqbee-io Affected before 1.26.25 Fixed in 1.26.25 Patch available CNA
  • go.qbee.io/transport (Go) Vendor— Affected before 1.26.25 Fixed in 1.26.25 Patch available GHSA-f9m7-vc86-p6jj

Remediation

  • Fix · CNA transport (qbee-io) Fixed in 1.26.25
  • Fix · GHSA-f9m7-vc86-p6jj go.qbee.io/transport (Go) Fixed in 1.26.25 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55828
  2. 2026-10-03 Alias added: GHSA-f9m7-vc86-p6jj

References

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences