CVE-2026-26187

High

Published: 13 February 2026

Published

13 February 2026

Modified

18 February 2026

KEV Added

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Patch

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CVSS Score 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Score 0.0007 20.6th percentile

Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

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 20.6th 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).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 2 other techniques. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

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.

AC-3 Access Enforcement good match

prevent

Mandates enforcement mechanisms that restrict access to only authorized storage paths and namespaces, mitigating the failure to verify path separators and object identifier boundaries.

SI-2 Flaw Remediation good match

prevent

Ensures timely identification, reporting, and correction of the path traversal flaw through patching to lakeFS v1.77.0 or later.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1005 Data from Local System Collection

Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.

attack.mitre.org →

T1565.001 Stored Data Manipulation Impact

Adversaries may insert, delete, or manipulate data at rest in order to influence external outcomes or hide activity, thus threatening the integrity of the data.

attack.mitre.org →

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.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD 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.

Deeper analysisAI

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.