Siemens kas up to 5.2 data authenticity

Summaryinfo

A vulnerability was found in Siemens kas up to 5.2. It has been rated as problematic. This impacts an unknown function. The manipulation leads to data authenticity. This vulnerability is uniquely identified as CVE-2026-47191. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Siemens kas up to 5.2 and classified as problematic. This issue affects an unknown function. The manipulation with an unknown input leads to a data authenticity vulnerability. Using CWE to declare the problem leads to CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. Impacted is integrity. The summary by CVE is:

kas is a setup tool for bitbake based projects. Prior to version 5.3, when relying solely on a git commit ID (SHA-1 or SHA-256) to qualify if a checkout of a repository is equivalent to the state validated while adding its commit ID to a kas configuration, users may be tricked to check out a branch of the same name from this repository. This implies that the referenced repository has been taken over by an attacker and modified to carry such a branch. SHA-1 commits may also be replaced by creating hash collisions, so the primary impact of this issue is on SHA-256 commit IDs. Version 5.3 fixes the issue. As a workaround, avoid relying solely on the commit ID for integrity validation of a repository that might become under control of a malicious 3rd party. If available, additional validate cryptographically signed commits or tags. Alternatively, mirror the repository to a save place, validate its integrity, and use this instead of the original one.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-47191 since 05/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/14/2026).

Upgrading to version 5.3 eliminates this vulnerability.

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Productinfo

Vendor

• Siemens

Name

• kas

Version

• 5.0
• 5.1
• 5.2

License

• commercial

Website

• Vendor: https://www.siemens.com/
• Product: https://github.com/siemens/kas/

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