{"id":"CVE-2026-54548","state":"PUBLISHED","title":"kas: Persistent SSH Host Key Checking Disablement","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.","publishedAt":"2026-08-26T14:17:32.620Z","updatedAt":"2026-08-26T15:36:30.207Z","severity":{"score":3.3,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["siemens kas"],"affected":[{"vendor":"siemens","product":"kas","versions":[{"version":"< 5.4","status":"affected"}]}],"references":["https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94","https://github.com/siemens/kas/commit/1c1e861c9f241ce082b86bef6bedc7da9b676294","https://github.com/siemens/kas/releases/tag/5.4"],"weaknesses":["CWE-295"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54548.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54548","state":"PUBLISHED","datePublished":"2026-08-26T14:17:32.620Z","dateUpdated":"2026-08-26T15:36:30.207Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-15T19:04:14.456Z"},"containers":{"cna":{"title":"kas: Persistent SSH Host Key Checking Disablement","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."}],"affected":[{"vendor":"siemens","product":"kas","versions":[{"version":"< 5.4","status":"affected"}]}],"references":[{"url":"https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94","name":"https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/siemens/kas/commit/1c1e861c9f241ce082b86bef6bedc7da9b676294","name":"https://github.com/siemens/kas/commit/1c1e861c9f241ce082b86bef6bedc7da9b676294","tags":["x_refsource_MISC"]},{"url":"https://github.com/siemens/kas/releases/tag/5.4","name":"https://github.com/siemens/kas/releases/tag/5.4","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-295","lang":"en","description":"CWE-295: Improper Certificate Validation","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-26T14:17:32.620Z"},"source":{"advisory":"GHSA-mv8m-v9v6-5f94","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-26T15:36:30.207Z"}}]}}}