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.
References7
- github.com/uber/kraken
- github.com/uber/kraken/blob/v0.1.27/build-index/tagserver/serve…
- github.com/uber/kraken/blob/v0.1.27/lib/backend/namepath/pather…
- github.com/uber/kraken/blob/v0.1.27/lib/backend/testfs/server.g…
- github.com/uber/kraken/issues/645
- www.vulncheck.com/advisories/uber-kraken-through-0.1.29-path-tr…
- github.com/uber/kraken/issues/645
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 4.0
-
8.7
HIGH
Score source: CNA
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:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 50 · as of 8 November 2026
- CWE
- CWE-22
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