CVE-2026-26187
HIGH
GHSA-699m-4v95-rmpm
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
3Tags
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.
Analysis
Authenticated users in lakeFS prior to version 1.77.0 can exploit path traversal vulnerabilities in the local block adapter to read and write files outside their intended storage boundaries by bypassing insufficient prefix validation checks. An attacker with valid credentials can manipulate object identifiers and path sequences to access sibling directories and storage namespaces they should not have access to. …
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Remediation
Within 24 hours: Inventory all lakeFS deployments and confirm versions; assess if systems are internet-facing or accessible to untrusted users. Within 7 days: Apply vendor patch to upgrade all instances to version 1.77.0 or later; validate patch deployment in test environment first. …
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