File Write Vulnerability in BentoML Affects AI Serving Systems
CVE-2026-27905
Key Information:
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What is CVE-2026-27905?
CVE-2026-27905 is a notable vulnerability in BentoML, a Python library designed for creating online serving systems that facilitate the deployment and inference of artificial intelligence models. This vulnerability arises in the safe_extract_tarfile() function, which is responsible for extracting tar files in a secure manner. Prior to version 1.4.36, the function inadequately validated the paths of symbolic link members within tar files. Specifically, it failed to verify whether the target of these symlinks remained within the intended extraction directory, allowing an attacker to craft a malicious tar file. By leveraging this oversight, an attacker could create symlinks that point outside the designated directory, along with regular files that write through these symlinks, resulting in arbitrary file writes on the host system. This vulnerability can lead to serious security implications for organizations utilizing BentoML in managing AI model deployments, as it may permit unauthorized file system modifications.
Potential impact of CVE-2026-27905
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Arbitrary File Write: The most critical risk posed by this vulnerability is the ability for an attacker to execute arbitrary file writes on the host machine. This could compromise system integrity, potentially leading to unauthorized data manipulation or exposure.
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Escalation of Privileges: If exploited, this vulnerability could allow attackers to modify sensitive files or configurations, potentially escalating their privileges within the system. This could lead to further exploitation or control over the hosting environment.
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Compromise of AI Applications: As BentoML is specifically utilized for AI application deployment, the ability to manipulate files could directly affect the models and data being served. This could result in degraded performance, incorrect outcomes, or the introduction of malicious elements into the AI applications, severely impacting business operations and decision-making processes.
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Affected Version(s)
BentoML < 1.4.36