{"cve":"CVE-2026-47192","nvd":{"published":"2026-08-14T17:18:15.563","modified":"2026-09-18T20:09:01.757","status":"Deferred","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","score":2.1},"cvss_v3":null,"cwes":["CWE-347"],"references":["https://github.com/pypa/advisory-database/tree/main/vulns/kas/PYSEC-2026-2543.yaml","https://github.com/siemens/kas/commit/4cb4a3d01122ffaec9feaae768a5814092f6f9b5","https://github.com/siemens/kas/commit/5b2114becfc154b16ef496d24f8c2191a2297f57","https://github.com/siemens/kas/security/advisories/GHSA-4vqc-wpwg-vh7j","https://github.com/siemens/kas/security/advisories/GHSA-qjwp-hrq6-r26r"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:48:17.459049833+00:00"},"epss":{"cve":"CVE-2026-47192","score":0.00254,"percentile":0.17005,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-4vqc-wpwg-vh7j","url":"https://osv.dev/vulnerability/GHSA-4vqc-wpwg-vh7j","summary":"kas's late signature validation may allow unnoticed repository manipulations","modified":"2026-08-15T05:20:18.368693170Z","packages":[{"ecosystem":"PyPI","name":"kas","purl":"pkg:pypi/kas","ranges":[">=4.8 <5.3"],"fixed":["5.3"]}]},{"id":"PYSEC-2026-2543","url":"https://osv.dev/vulnerability/PYSEC-2026-2543","summary":"kas's late signature validation may allow unnoticed repository manipulations","modified":"2026-07-13T16:32:00.107887665Z","packages":[{"ecosystem":"PyPI","name":"kas","purl":"pkg:pypi/kas","ranges":[">=4.8 <5.3"],"fixed":["5.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}