CVE-2026-55828: Go.qbee.io/transport Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-f9m7-vc86-p6jj
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CWE-59 CWE-22
Published
Advisory Summary

CVE-2026-55828 is a MODERATE path traversal vulnerability (CWE-59: Improper Link Resolution Before File Access ('Link Following')) affecting Go.qbee.io/transport libraries in the Go ecosystem. The issue involves symlink-chain path traversal in tar extraction (one level outside destination). Remediation is available by upgrading affected packages to version 1.26.25.

CVE-2026-55828 at a Glance

CVE Identifier CVE-2026-55828
GHSA Identifier GHSA-f9m7-vc86-p6jj
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-59: Improper Link Resolution Before File Access ('Link Following')
Affected Product Go.qbee.io/transport
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-55828

To remediate this vulnerability, upgrade all affected Go.qbee.io/transport dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

go.qbee.io/transport fixed: 1.26.25 
Upgrade go.qbee.io/transport to 1.26.25
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for go.qbee.io/transport

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-55828, inspect your project dependencies for Go.qbee.io/transport:

inspect dependencies for go.qbee.io/transport

Analyze the terminal output to locate any version of Go.qbee.io/transport in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.26.25), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following'), where the product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. In Go.qbee.io/transport, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact The go.qbee.io/transport library is affected by a symlink-chain path traversal vulnerability in its extractTar routine. The library's path validation is strictly lexical and fails to account for on-disk symlinks created earlier in the extraction process. Consequently, a crafted tar archive can be used to write or overwrite files one directory level above the intended extraction path. In the case of qbee-agent, which runs with root privileges, this vulnerability permits a root-privileged file write outside the intended destination. ### Patches The issue has been addressed in version v1.26.25

CVE-2026-55828 Affected Go.qbee.io/transport Versions

1 component(s)
Fixed Versions:
1.26.25
Product / Package Ecosystem Affected Versions Fixed Version
go.qbee.io/transport
golang/go.qbee.io/transport
Go
< 1.26.25
1.26.25

References

GitHub Advisory / Wiki ADVISORY
https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj
Go.qbee.io/transport Source Repository REPOSITORY
https://github.com/qbee-io/transport

Frequently Asked Questions

What is CVE-2026-55828?
CVE-2026-55828 is a security vulnerability in Go.qbee.io/transport involving Symlink-chain path traversal in tar extraction (one level outside destination) under CWE-59: Improper Link Resolution Before File Access ('Link Following').
Which Go.qbee.io/transport versions are affected?
Affected versions include releases prior to 1.26.25 across affected packages: go.qbee.io/transport.
What version fixes CVE-2026-55828?
Upgrading to 1.26.25 (or the latest patched release for your respective branch) resolves the vulnerability.
Is go.qbee.io/transport affected?
Yes, go.qbee.io/transport is affected in releases prior to 1.26.25. Upgrade your dependency to 1.26.25 or later.
What CWE is associated with CVE-2026-55828?
CVE-2026-55828 is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following') (The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.).
How can I check Go dependencies for CVE-2026-55828?
Run the dependency tree command: 'inspect dependencies for go.qbee.io/transport'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-f9m7-vc86-p6jj",
  "modified" : "2026-06-19T21:15:31Z",
  "published" : "2026-06-19T21:15:31Z",
  "aliases" : [ "CVE-2026-55828" ],
  "summary" : "go.qbee.io/transport: Symlink-chain path traversal in tar extraction (one level outside destination)",
  "details" : "### Impact\n\nThe go.qbee.io/transport library is affected by a symlink-chain path traversal vulnerability in its extractTar routine. The library's path validation is strictly lexical and fails to account for on-disk symlinks created earlier in the extraction process. Consequently, a crafted tar archive can be used to write or overwrite files one directory level above the intended extraction path. In the case of qbee-agent, which runs with root privileges, this vulnerability permits a root-privileged file write outside the intended destination.\n\n### Patches\n\nThe issue has been addressed in version v1.26.25",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "go.qbee.io/transport"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.26.25"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/qbee-io/transport"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22", "CWE-59" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-19T21:15:31Z",
    "nvd_published_at" : null
  }
}