CVE-2026-54548

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-54548", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-15T19:04:14.456Z", "datePublished": "2026-08-26T14:17:32.620Z", "dateUpdated": "2026-08-26T15:36:30.207Z"}, "containers": {"cna": {"title": "kas: Persistent SSH Host Key Checking Disablement", "problemTypes": [{"descriptions": [{"cweId": "CWE-295", "lang": "en", "description": "CWE-295: Improper Certificate Validation", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 3.3, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94"}, {"name": "https://github.com/siemens/kas/commit/1c1e861c9f241ce082b86bef6bedc7da9b676294", "tags": ["x_refsource_MISC"], "url": "https://github.com/siemens/kas/commit/1c1e861c9f241ce082b86bef6bedc7da9b676294"}, {"name": "https://github.com/siemens/kas/releases/tag/5.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/siemens/kas/releases/tag/5.4"}], "affected": [{"vendor": "siemens", "product": "kas", "versions": [{"version": "< 5.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-26T14:17:32.620Z"}, "descriptions": [{"lang": "en", "value": "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": {"advisory": "GHSA-mv8m-v9v6-5f94", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-26T15:34:06.387299Z", "id": "CVE-2026-54548", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-26T15:36:30.207Z"}}]}}

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{"affected": [{"affectedData": [{"product": "kas", "vendor": "siemens", "versions": [{"status": "affected", "version": "< 5.4"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-54548", "lastModified": "2026-09-09T21:09:13.080", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 3.3, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 0.8, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54548", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-26T15:34:06.387299Z", "version": "2.0.3"}}]}, "published": "2026-08-26T15:16:49.070", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/siemens/kas/commit/1c1e861c9f241ce082b86bef6bedc7da9b676294"}, {"source": "security-advisories@github.com", "url": "https://github.com/siemens/kas/releases/tag/5.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,5.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "kas", "source": "cna", "vendor": "siemens"}, "product": "kas", "vendor": "siemens"}], "created": "2026-08-26T17:45:03.752061+00:00", "updated": "2026-08-26T19:30:05.027588+00:00", "vendors": ["siemens", "siemens$PRODUCT$kas"]}