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CVE-2026-54548— kas: Persistent SSH Host Key Checking Disablement

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.

Kas 是一个用于基于 bitbake 项目的配置工具。在 5.4 版本之前，当不存在用户特定的 SSH 配置时，由 SSH_PRIVATE_KEY 或 SSH_PRIVATE_KEY_FILE 触发的内部 SSH 密钥设置会创建 ~/.ssh/config 文件，并添加一条全局的 Host * 规则，其中包含 StrictHostKeyChecking no。在 kas/libcmds.py 中，ssh_no_host_key_check() 函数在执行时并未检查 ctx.managed_env，导致该设置在 k

CVSS 3.3 · Low

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
siemens kas < 5.4 affected
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I. Basic Information for CVE-2026-54548

Vulnerability Information
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Vulnerability Title
kas: Persistent SSH Host Key Checking Disablement
Source: CVE Program / CVE List V5
Vulnerability Description
kas is a setup tool for bitbake based projects. Prior to 5.4, internal SSH key setup triggered by SSH_PRIVATE_KEY or SSH_PRIVATE_KEY_FILE creates ~/.ssh/config when no user-specific SSH configuration exists and adds a global Host * rule containing StrictHostKeyChecking no. In kas/libcmds.py, ssh_no_host_key_check() runs without checking ctx.managed_env, so the setting persists after kas exits and affects future SSH sessions by the same local user, extending beyond the intended short-lived continuous integration environment. A later SSH connection can therefore accept an attacker-controlled host key without verification, increasing the risk of a man-in-the-middle attack that compromises session confidentiality or integrity. This issue is fixed in version 5.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siemens kas < 5.4 -

II. Public POCs for CVE-2026-54548

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III. Intelligence Information for CVE-2026-54548

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Patches & Fixes for CVE-2026-54548 (1)

Vendor Advisories for CVE-2026-54548 (1)

Vendor Pages for CVE-2026-54548 (1)

IV. Related Vulnerabilities

Same product: kas
Same vendor: siemens
Same weakness: CWE-295

V. Comments for CVE-2026-54548

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