Path Traversal in Uber Kraken
CVE-2026-92791
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (49.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/uber/kraken/issues/645 (issue-tracking)
- github.com/uber/kraken (product)
- github.com/uber/kraken/blob/v0.1.27/lib/backend/namepath/pather.go (technical-description)
- github.com/uber/kraken/blob/v0.1.27/lib/backend/testfs/server.go (technical-description)
- github.com/uber/kraken/blob/v0.1.27/build-index/tagserver/server.go (technical-description)
- www.vulncheck.com/advisories/uber-kraken-through-0.1.29-path-traversal-via-tag-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92791?
- CVE-2026-92791 is a high-severity vulnerability in Uber Kraken, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-09-16.
- How severe is CVE-2026-92791?
- High severity. CVSS v3 base score is 7.5 out of 10.