CVE-2026-47191 kas checks out SHA-like git branches as valid commits
Attackers can trick kas into checking out malicious branches instead of validated commits, enabling supply chain attacks on Bitbake projects.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-47191?
CVE-2026-47191 is a low-severity vulnerability in siemens kas, published on 14 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-347
Which versions are affected by CVE-2026-47191?
3 open source packages ship an affected version, including kas.
| Package | Affected | Fixed in |
|---|---|---|
kas PyPI | All versions | 5.3 |
kas PyPI | All versions | 5.3 |
kas PyPI | All versions | 5.3 |
How do I fix CVE-2026-47191?
Upgrade kas to 5.3 or later.
Is CVE-2026-47191 being exploited?
There is no known exploitation of CVE-2026-47191 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-47191, GHSA-qjwp-hrq6-r26r, PYSEC-2026-2544, UBUNTU-CVE-2026-47191.