Bug 2550349 (CVE-2026-109156)

Summary: CVE-2026-109156 mlserver: MLServer: Arbitrary file write via path traversal in environment archive extraction
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in MLServer. A remote attacker could achieve arbitrary file write by supplying a specially crafted environment archive containing path traversal sequences. Because the environment extraction handler does not adequately validate destination paths before unpacking, archive files can be written outside the intended target directory. This unauthorized file write could allow an attacker to overwrite sensitive data or disrupt service operations.
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Description OSIDB Bzimport 2026-10-13 10:42:04 UTC 
A vulnerability has been found in SeldonIO MLServer up to 1.6.1. Affected is the function _extract_env of the file mlserver/env.py of the component environment_tarball Handler. Such manipulation leads to path traversal. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.