CVE-2026-54548

low

Assigned by CNA: github_m

Published 2026-08-26 · Modified 2026-08-26

Discuss on Community Propose mitigation

CVSS v3

3.3

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS v4 NEW

—

not yet in upstream

VIR risk

3.3

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.

Predictions

Exploit likelihood

34%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-54548 NameCVE-2026-54548 SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) Vulnerable and fixed packages The table below lists information on source packages. Source PackageReleaseVersionStatus kas (PTS)bullseye2.3.3-2vulnerable bookworm3.1-2vulnerable trixie4.8.1-2vulnerable…

CVE-2026-54548

Name	CVE-2026-54548
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
kas (PTS)	bullseye	2.3.3-2	vulnerable
	bookworm	3.1-2	vulnerable
	trixie	4.8.1-2	vulnerable
	forky, sid	5.3-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
kas	source	(unstable)	5.4-1

Notes

[trixie] - kas <no-dsa> (Minor issue)
https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

[trixie] - kas <no-dsa> (Minor issue)https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94

OS impact

Debian Mixed 5 releases

Version	Status	Fixed in
trixie	Affected	—
sid	Fixed	`5.4-1`
forky	Fixed	`5.4-1`
bullseye	Affected	—
bookworm	Affected	—

References

CWEs

CWE-295

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.