CVE-2026-54548
Siemens · published 2026-08-26
Source record Collected from the National Vulnerability Database (NVD)
Description
Description by GitHub, Inc. via the CVE Program.
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.
Filed by GitHub, Inc.; not a statement by Siemens.
Status at the source
- NVD status: Deferred — NVD has not analysed this CVE.
Affected products, as the source lists them
| Vendor | Product | Versions |
|---|---|---|
| siemens | kas | < 5.4: affected |
DeSpy has not checked any unit, hardware revision or firmware. A product missing here is not a statement that it is unaffected.
Scores, as their sources published them
- CVSS 3.1: 3.3 LOW — as published by GitHub, Inc. (Secondary)
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N - SSVC — CISA's assessment (SSVC 2.0.3, CISA Coordinator): Exploitation: none · Automatable: no · Technical impact: partial
DeSpy does not score records. These are the sources' own values.
Weaknesses
Sources
References the source lists
- https://github.com/siemens/kas/commit/1c1e861c9f241ce082b86bef6bedc7da9b676294
- https://github.com/siemens/kas/releases/tag/5.4
- https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94
Source dates: published 2026-08-26, last changed 2026-09-09. DeSpy's copy of this version is dated 2026-09-28.
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