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CVE-2026-54548: CWE-295: Improper Certificate Validation in siemens kas

0
Low
VulnerabilityCVE-2026-54548cvecve-2026-54548cwe-295
Published: 08/26/2026 (08/26/2026, 14:17:32 UTC)
Source: CVE Database V5
Vendor/Project: siemens
Product: kas

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.

CVSS v3.1

Score 3.3low

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

Technical Details

Data Version
5.2
Assigner Short Name
GitHub_M
Date Reserved
2026-06-15T19:04:14.456Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a8ef6f6acd9273b49fd6371

Added to database: 08/26/2026, 14:23:50 UTC

Last updated: 08/26/2026, 15:20:55 UTC

Views: 5

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