---
id: CVE-2026-92791
title: >-
  Uber Kraken through 0.1.29 fails to validate the tag parameter in the
  /tags/{tag} endpoint, allowing unauthenticated attackers to traverse outside
  the configured storage root
summary: >-
  Uber Kraken through 0.1.29 fails to validate the tag parameter in the
  /tags/{tag} endpoint, allowing unauthenticated attackers to traverse outside
  the configured storage root. Attackers can use percent-encoded
  parent-directory segments i…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
vendor: uber
product: kraken
affected:
  - kraken <= 0.1.29
published: '2026-09-16'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:08:55.030'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92791'
references:
  - url: 'https://github.com/uber/kraken'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/uber/kraken/blob/v0.1.27/build-index/tagserver/server.go#L128-L129
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/uber/kraken/blob/v0.1.27/lib/backend/namepath/pather.go#L78-L84
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/uber/kraken/blob/v0.1.27/lib/backend/testfs/server.go#L165-L173
    label: disclosure@vulncheck.com
  - url: 'https://github.com/uber/kraken/issues/645'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/uber-kraken-through-0.1.29-path-traversal-via-tag-parameter
    label: disclosure@vulncheck.com
  - url: 'https://github.com/uber/kraken/issues/645'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00613
epssPercentile: 0.47054
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T15:41:31.488017Z'
ingestedAt: '2026-09-16T21:05:36.887Z'
---

## Overview

Uber Kraken through 0.1.29 fails to validate the tag parameter in the /tags/{tag} endpoint, allowing unauthenticated attackers to traverse outside the configured storage root. Attackers can use percent-encoded parent-directory segments in the tag parameter to read arbitrary files accessible to the testfs backend process.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.