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CVE-2026-47191— kas checks out SHA-like git branches as valid commits

Quick assessment

Affected
siemens kas
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Siemens kas是德国Siemens公司的一款网络服务器设备。 Siemens kas 5.3之前版本存在加密问题漏洞，该漏洞源于仅依赖git提交ID验证仓库完整性，用户可能被诱骗检出同名恶意分支，导致检出被篡改的代码。

CVSS 2.1 · Low EPSS 0.25% · P14

Possible ATT&CK Techniques 1 AI

T1195.002 · Compromise Software Supply Chain

Affected Version Matrix 1

VendorProduct Version RangeStatus
siemens kas < 5.3 affected
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I. Basic Information for CVE-2026-47191

Vulnerability Information
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Vulnerability Title
kas checks out SHA-like git branches as valid commits
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Siemens kas 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Siemens kas是德国Siemens公司的一款网络服务器设备。 Siemens kas 5.3之前版本存在加密问题漏洞，该漏洞源于仅依赖git提交ID验证仓库完整性，用户可能被诱骗检出同名恶意分支，导致检出被篡改的代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siemens kas < 5.3 -

II. Public POCs for CVE-2026-47191

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III. Intelligence Information for CVE-2026-47191

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Patches & Fixes for CVE-2026-47191 (1)

Vendor Advisories for CVE-2026-47191 (2)

IV. Related Vulnerabilities

Same product: kas
Same vendor: siemens
Same weakness: CWE-347

V. Comments for CVE-2026-47191

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