{"id":"AZL-87173","summary":"CVE-2026-39831 affecting package buildah 1.43.1-2","details":"The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a \"no-touch-required\" extension in Permissions.Extensions from PublicKeyCallback.","modified":"2026-09-02T05:29:58Z","published":"2026-05-22T04:16:22Z","upstream":["CVE-2026-39831"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39831"}],"affected":[{"package":{"name":"buildah","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/buildah"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.43.1-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-87173.json"}}],"schema_version":"1.9.0"}