Microsoft AVML up to 0.16.x Symlink open destination symlink

Summaryinfo

A vulnerability was found in Microsoft AVML up to 0.16.x. It has been classified as problematic. Impacted is the function Open of the component Symlink Handler. The manipulation of the argument destination leads to symlink. This vulnerability is uniquely identified as CVE-2026-61371. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Microsoft AVML up to 0.16.x. This issue affects the function open of the component Symlink Handler. The manipulation of the argument destination with an unknown input leads to a symlink vulnerability. Using CWE to declare the problem leads to CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Microsoft AVML before 0.17.0 could follow a symlink when opening a destination output path on Unix, allowing truncation/overwrite of the symlink target. The destructive effect is performed at open-time via O_TRUNC, and can happen before full input validation completes (“truncation-before-validation”).

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-61371 since 07/08/2026. The exploitation is known to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/15/2026).

Upgrading to version 0.17.0 eliminates this vulnerability.

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Productinfo

Vendor

• Microsoft

Name

• AVML

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://github.com/microsoft/avml/

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