Vulnerability details

CVE-2026-92791

uber kraken

Uber Kraken through 0.1.29 Path Traversal via tag parameter

CVSS 4.0

8.7High

Official description

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.

CVSS scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`
7.5High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

Affected products

Vendor	Product	Versions	Source
uber	kraken	v ≤ 0.1.29	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/uber/kraken product
https://github.com/uber/kraken/blob/v0.1.27/lib/backend/namepath/pather.go#L78-L84 technical-description
https://github.com/uber/kraken/blob/v0.1.27/lib/backend/testfs/server.go#L165-L173 technical-description
https://github.com/uber/kraken/blob/v0.1.27/build-index/tagserver/server.go#L128-L129 technical-description
https://www.vulncheck.com/advisories/uber-kraken-through-0.1.29-path-traversal-via-tag-parameter third-party-advisory
https://github.com/uber/kraken/issues/645 issue-tracking

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Details

Published: 2026-09-17
Last updated: 2026-09-21
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.61%

Probability of exploitation in 30 days

49.6%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')