CVE-2026-47191 json
kas checks out SHA-like git branches as valid commits
published 2026-06-01 5 mo ago modified 2026-09-18 51 d ago also GHSA-qjwp-hrq6-r26r , PYSEC-2026-2544 , EUVD-2026-58719
- cvss
- 2.1
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.25% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 2.1 | 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 |
| CNA | 4.0 | 2.1 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | kas | <5.3 |
5.3 |
Affected products
- siemens kas
Classification
- Weakness
-
- CWE-347 Improper Verification of Cryptographic Signature
References
-
github.com
/siemens/kas/commit/4cb4a3d01122ffaec9feaae768a5814092f6f9b5
web
-
github.com
/siemens/kas/security/advisories/GHSA-qjwp-hrq6-r26r
web
- github.com /pypa/advisory-database/tree/main/vulns/kas/PYSEC-2026-2544.yaml
-
github.com
/siemens/kas
package
-
pypi.org
/project/kas
package
-
github.com
/advisories/GHSA-qjwp-hrq6-r26r
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-47191
advisory
Sources
- CVE List CVE-2026-47191
- GitHub Advisory GHSA-qjwp-hrq6-r26r
- NVD CVE-2026-47191
- OSV PYSEC-2026-2544
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.