Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
qbee-io transport
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

qbee transport 是一个远程访问传输协议的实现。在 1.26.25 版本之前， 例程仅使用严格的词汇级路径校验，未考虑在解包过程中先前创建的磁盘上的符号链接。一个精心构造的 tar 压缩包可以利用符号链接链，在目标解包路径上一级目录中写入或覆盖文件。当 qbee-agent 以 root 权限执行解包操作时，此问题允许在预期目标之外写入 root 权限的文件。该问题已在 1.26.25 版本中修复。

CVSS 6.0 · Medium EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
qbee-io transport < 1.26.25 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-55828

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
qbee transport: Symlink-chain path traversal in tar extraction (one level outside destination)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
qbee-io transport < 1.26.25 -

II. Public POCs for CVE-2026-55828

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-55828

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-55828 (2)

Vendor Advisories for CVE-2026-55828 (1)

IV. Related Vulnerabilities

Same weakness: CWE-22

V. Comments for CVE-2026-55828

No comments yet

Leave a comment