Vulnerability Description
lakeFS is an open-source tool that transforms object storage into a Git-like repositories. Prior to 1.77.0, the local block adapter (pkg/block/local/adapter.go) allows authenticated users to read and write files outside their designated storage boundaries. The verifyRelPath function used strings.HasPrefix() to verify that requested paths fall within the configured storage directory. This check was insufficient because it validated only the path prefix without requiring a path separator, allowing access to sibling directories with similar names. Also, the adapter verified that resolved paths stayed within the adapter's base path, but did not verify that object identifiers stayed within their designated storage namespace. This allowed attackers to use path traversal sequences in the object identifier to access files in other namespaces. Fixed in version v1.77.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Lakefs | Lakefs | < 1.77.0 |
Related Weaknesses (CWE)
References
- https://github.com/treeverse/lakeFS/commit/cbc106275357302a834280f133265dc39f138Patch
- https://github.com/treeverse/lakeFS/releases/tag/v1.77.0ProductRelease Notes
- https://github.com/treeverse/lakeFS/security/advisories/GHSA-699m-4v95-rmpmMitigationVendor Advisory
FAQ
What is CVE-2026-26187?
CVE-2026-26187 is a vulnerability with a CVSS score of 8.1 (HIGH). lakeFS is an open-source tool that transforms object storage into a Git-like repositories. Prior to 1.77.0, the local block adapter (pkg/block/local/adapter.go) allows authenticated users to read and ...
How severe is CVE-2026-26187?
CVE-2026-26187 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-26187?
Check the references section above for vendor advisories and patch information. Affected products include: Lakefs Lakefs.