CVE-2026-47192 kas's late signature validation may allow unnoticed repository manipulations
Attackers can bypass signature validation in kas to inject malicious configurations, potentially leading to code execution if specific repository and key conditions are met.
- 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-2026-47192?
CVE-2026-47192 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. Starting in version 4.8 and prior to version 5.3, kas checks out and processes repositories regarding configuration includes prior to validating signatures of those repositories. This may allow to replace on original repository with one under the control of an attacker under very specific conditions. First of all, the attacker must have gained control of a repository that a kas file of the victim is referencing. Furthermore, the following conditions must be fulfilled: the victim's kas configuration must include a configuration file from the attacked repository; the repository state is referenced by tag, and no commit ID is specified (this is triggering a warning, though); the key used for validating the tag or commit signature is stored as file in a repository; no fingerprint for the key is specified; and the `_source_dir` key must not be set by the victim when calling kas (e.g. by avoiding a local `.config.yaml`). Given these conditions, the attacker could modify the included kas configuration in way that the key used to validate the tag signature of the attacker's repository could be replaced by an attacker-chosen key. No other exploit possibilities have been identified so far, but this does not rule out that those may exist. All patches have been released along with kas version 5.3. As a workaround, pin the expected signature key via its fingerprint, also when storing it as file in a repository.
Weakness: CWE-347
Which versions are affected by CVE-2026-47192?
3 open source packages ship an affected version, including kas.
| Package | Affected | Fixed in |
|---|---|---|
kas PyPI | From 4.8 | 5.3 |
kas PyPI | From 4.8 | 5.3 |
kas PyPI | From 4.8 | 5.3 |
How do I fix CVE-2026-47192?
Upgrade kas to 5.3 or later.
Is CVE-2026-47192 being exploited?
There is no known exploitation of CVE-2026-47192 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-47192, GHSA-4vqc-wpwg-vh7j, PYSEC-2026-2543, UBUNTU-CVE-2026-47192.