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Vulnerability record · CVE-2026-92791 · published 16 September 2026

CVE-2026-92791: Path traversal vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.61% · top 52.7% CWE-22 · Path traversal Deferred
8.7CVSS 4.0 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
24 Sep 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-92791), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.