Vulnerability · Published Feb 13, 2026 · Assigned by GitHub_M
CVE-2026-26187lakeFS vulnerable to path traversal in local block adapter allow cross-namespace and sibling directory access
High 8.1
In plain English
A high-severity path traversal in lakeFS from treeverse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/treeverse/lakefs | 1.77.0 | GHSA-699m-4v95-rmpm |
| Go | github.com/treeverse/lakefs | 1.77.0 | GO-2026-4494 |
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
References
- https://github.com/treeverse/lakeFS/security/advisories/GHSA-699m-4v95-rmpm x_refsource_CONFIRM
- https://github.com/treeverse/lakeFS/commit/cbc106275357302a834280f133265dc39f1384ce x_refsource_MISC
- https://github.com/treeverse/lakeFS/releases/tag/v1.77.0 x_refsource_MISC