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PatchSiren cyber security CVE debrief

CVE-2026-47192 siemens CVE debrief

A setup tool for bitbake based projects, kas, processes repositories prior to validating signatures under specific conditions, allowing potential replacement of original repositories with attacker-controlled ones. This vulnerability, present in versions 4.8 and prior to 5.3, can be exploited if an attacker has control of a repository referenced by a kas file, and specific configurations are in place, such as referencing a repository state by tag without a commit ID, not specifying a key fingerprint for validation, and not setting the '_source_dir' key. The exploitation could allow an attacker to replace the key used for validating the tag signature of their repository with an - -

Vendor
siemens
Product
kas
CVSS
LOW 2.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-14
Original CVE updated
2026-09-18
Advisory published
2026-08-14
Advisory updated
2026-09-18

Who should care

Defenders responsible for bitbake based projects using kas should assess exposure and verify kas configurations to prevent potential exploitation. This includes reviewing configurations for secure repository references, ensuring the '_source_dir' key is set, and pinning expected signature keys via fingerprints. Security teams and vulnerability management teams should prioritize verifying kas configurations and ensuring secure practices are in place.

Why it matters

Defenders should prioritize verifying kas configurations and pinning expected signature keys to prevent potential exploitation of the kas vulnerability.

  • Verify kas configurations to prevent repository replacement.
  • Pin expected signature keys to prevent key tampering.
  • Ensure secure repository references to prevent exploitation.

Technical summary

kas, a setup tool for bitbake based projects, checks out and processes repositories regarding configuration includes prior to validating signatures of those repositories. This may allow an attacker to replace an original repository with one under their control under very specific conditions, such as when the victim's kas configuration includes a configuration file from the attacked repository, the repository state is referenced by tag without a commit ID, and no fingerprint for the key is specified. The patches released with kas version 5.3 fix this vulnerability.

Defensive priority

Defenders should prioritize verifying kas configurations, pinning expected signature keys via fingerprints, and ensuring the '_source_dir' key is set when calling kas.

Recommended defensive actions

  • Verify kas configurations to ensure secure repository references.
  • Pin expected signature keys via their fingerprints when storing them as files in repositories.
  • Ensure the '_source_dir' key is set when calling kas to prevent potential exploitation.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in kas, including conditions for exploitation and patches released. Defenders should verify kas configurations, pin expected signature keys via fingerprints, and ensure the '_source_dir' key is set when calling kas. Evidence is limited to public CVE details and NVD assessments; further verification tasks are recommended.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47192 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47192

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47192 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47192

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.