CVE-2026-55828: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in qbee-io transport
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.
AI Analysis
Technical Summary
The qbee-io transport protocol's extractTar routine prior to version 1.26.25 performs only lexical path validation and does not consider on-disk symlinks created earlier during extraction. An attacker can craft a tar archive with a symlink chain that causes files to be written or overwritten one directory level above the intended extraction path. When the qbee-agent extracts such archives with root privileges, this allows unauthorized root-level file writes outside the intended directory, constituting a path traversal vulnerability (CWE-22) combined with symlink handling issues (CWE-59). The issue is resolved in version 1.26.25.
Potential Impact
Successful exploitation permits an attacker to write or overwrite files with root privileges outside the intended extraction directory. This can lead to unauthorized modification of critical system files or configuration, potentially compromising system integrity and security. The CVSS 4.0 score is 6.0 (medium severity), reflecting the requirement for local privileges and partial attack complexity.
Mitigation Recommendations
Upgrade qbee-io transport to version 1.26.25 or later, where the vulnerability is fixed. No other mitigations are indicated by the vendor advisory. Patch status is confirmed fixed in 1.26.25.
CVE-2026-55828: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in qbee-io transport
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.
CVSS v4.0
Score 6.0medium
Affected software
qbee-io
transport
pkg:github/qbee-io/transportRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The qbee-io transport protocol's extractTar routine prior to version 1.26.25 performs only lexical path validation and does not consider on-disk symlinks created earlier during extraction. An attacker can craft a tar archive with a symlink chain that causes files to be written or overwritten one directory level above the intended extraction path. When the qbee-agent extracts such archives with root privileges, this allows unauthorized root-level file writes outside the intended directory, constituting a path traversal vulnerability (CWE-22) combined with symlink handling issues (CWE-59). The issue is resolved in version 1.26.25.
Potential Impact
Successful exploitation permits an attacker to write or overwrite files with root privileges outside the intended extraction directory. This can lead to unauthorized modification of critical system files or configuration, potentially compromising system integrity and security. The CVSS 4.0 score is 6.0 (medium severity), reflecting the requirement for local privileges and partial attack complexity.
Mitigation Recommendations
Upgrade qbee-io transport to version 1.26.25 or later, where the vulnerability is fixed. No other mitigations are indicated by the vendor advisory. Patch status is confirmed fixed in 1.26.25.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-17T16:29:38.864Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa9651655bf5e2cf502e930
Added to database: 09/15/2026, 15:32:38 UTC
Last enriched: 09/15/2026, 16:03:18 UTC
Last updated: 09/16/2026, 03:15:56 UTC
Views: 9
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.