CVE-2026-26187
Published: 13 February 2026
Summary
CVE-2026-26187 is a high-severity Path Traversal (CWE-22) vulnerability in Lakefs Lakefs. Its CVSS base score is 8.1 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 30.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2026-26187 is a path traversal vulnerability (CWE-22) in the local block adapter of lakeFS, an open-source tool that transforms object storage into Git-like repositories. Prior to version 1.77.0, the component in pkg/block/local/adapter.go inadequately validated paths using strings.HasPrefix() in the verifyRelPath function, which checked only the path prefix without requiring a separator. This permitted access to sibling directories with similar names. Additionally, while resolved paths were confined to the adapter's base path, object identifiers were not verified against their designated storage namespace, enabling path traversal sequences to reach files in other namespaces. The vulnerability has a CVSS v3.1 base score of 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N).
Authenticated users with low privileges can exploit this vulnerability remotely over the network with low complexity and no user interaction required. Successful exploitation allows attackers to read and write arbitrary files outside their designated storage boundaries, compromising high confidentiality and integrity without affecting availability. Attackers can leverage crafted object identifiers containing path traversal sequences to access data in sibling directories or other namespaces.
The vulnerability is fixed in lakeFS version v1.77.0, as detailed in the project's security advisory (GHSA-699m-4v95-rmpm), release notes, and the patching commit (cbc106275357302a834280f133265dc39f1384ce). Security practitioners should upgrade to v1.77.0 or later and review access controls for the local block adapter to mitigate risks.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5918
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote path traversal in public-facing lakeFS local block adapter directly enables T1190 exploitation for unauthorized local file read (T1005) and stored data manipulation (T1565.001) outside namespace boundaries.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires validation of object identifiers and paths to ensure they remain within designated storage boundaries, directly addressing the inadequate strings.HasPrefix() check vulnerable to path traversal.
Mandates enforcement mechanisms that restrict access to only authorized storage paths and namespaces, mitigating the failure to verify path separators and object identifier boundaries.
Ensures timely identification, reporting, and correction of the path traversal flaw through patching to lakeFS v1.77.0 or later.