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CVE-2026-47192— kas's late signature validation may allow unnoticed repository manipulations

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 4.8版本至5.3之前版本存在加密问题漏洞，该漏洞源于在验证仓库签名之前检出并处理配置包含，可能导致攻击者替换签名验证密钥。

CVSS 2.1 · Low EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
siemens kas >= 4.8, < 5.3 affected
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I. Basic Information for CVE-2026-47192

Vulnerability Information
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Vulnerability Title
kas's late signature validation may allow unnoticed repository manipulations
Source: CVE Program / CVE List V5
Vulnerability 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.
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 4.8版本至5.3之前版本存在加密问题漏洞，该漏洞源于在验证仓库签名之前检出并处理配置包含，可能导致攻击者替换签名验证密钥。
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 >= 4.8, < 5.3 -

II. Public POCs for CVE-2026-47192

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III. Intelligence Information for CVE-2026-47192

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Patches & Fixes for CVE-2026-47192 (2)

Vendor Advisories for CVE-2026-47192 (3)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-47192

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