{"id":"UBUNTU-CVE-2026-27890","details":"Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array class's grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.","modified":"2026-05-20T16:24:53.071595343Z","published":"2026-04-17T19:16:00Z","upstream":["CVE-2026-27890"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-27890"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-27890"},{"type":"REPORT","url":"https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49"}],"affected":[{"package":{"name":"firebird3.0","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/firebird3.0?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.2.32703.ds4-9","3.0.2.32703.ds4-11ubuntu1","3.0.2.32703.ds4-11ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"firebird3.0-common","binary_version":"3.0.2.32703.ds4-11ubuntu2"},{"binary_version":"3.0.2.32703.ds4-11ubuntu2","binary_name":"firebird3.0-examples"},{"binary_name":"firebird3.0-server","binary_version":"3.0.2.32703.ds4-11ubuntu2"},{"binary_name":"firebird3.0-server-core","binary_version":"3.0.2.32703.ds4-11ubuntu2"},{"binary_name":"firebird3.0-utils","binary_version":"3.0.2.32703.ds4-11ubuntu2"},{"binary_name":"libfbclient2","binary_version":"3.0.2.32703.ds4-11ubuntu2"},{"binary_version":"3.0.2.32703.ds4-11ubuntu2","binary_name":"libib-util"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27890.json"}},{"package":{"name":"firebird3.0","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/firebird3.0?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.5.33100.ds4-3","3.0.5.33189.ds4-1","3.0.5.33209.ds4-1","3.0.5.33220.ds4-1","3.0.5.33220.ds4-1build1","3.0.5.33220.ds4-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"firebird3.0-common","binary_version":"3.0.5.33220.ds4-1build2"},{"binary_name":"firebird3.0-examples","binary_version":"3.0.5.33220.ds4-1build2"},{"binary_name":"firebird3.0-server","binary_version":"3.0.5.33220.ds4-1build2"},{"binary_version":"3.0.5.33220.ds4-1build2","binary_name":"firebird3.0-server-core"},{"binary_name":"firebird3.0-utils","binary_version":"3.0.5.33220.ds4-1build2"},{"binary_version":"3.0.5.33220.ds4-1build2","binary_name":"libfbclient2"},{"binary_name":"libib-util","binary_version":"3.0.5.33220.ds4-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27890.json"}},{"package":{"name":"firebird3.0","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/firebird3.0?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.7.33374.ds4-2","3.0.8.33535.ds4-1ubuntu1","3.0.8.33535.ds4-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"firebird3.0-common","binary_version":"3.0.8.33535.ds4-1ubuntu2"},{"binary_name":"firebird3.0-examples","binary_version":"3.0.8.33535.ds4-1ubuntu2"},{"binary_name":"firebird3.0-server","binary_version":"3.0.8.33535.ds4-1ubuntu2"},{"binary_name":"firebird3.0-server-core","binary_version":"3.0.8.33535.ds4-1ubuntu2"},{"binary_name":"firebird3.0-utils","binary_version":"3.0.8.33535.ds4-1ubuntu2"},{"binary_name":"libfbclient2","binary_version":"3.0.8.33535.ds4-1ubuntu2"},{"binary_name":"libib-util","binary_version":"3.0.8.33535.ds4-1ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27890.json"}},{"package":{"name":"firebird3.0","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/firebird3.0?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.11.33637.ds4-2ubuntu1","3.0.11.33637.ds4-2ubuntu2","3.0.11.33703.ds4-2ubuntu1","3.0.11.33703.ds4-2ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"firebird3.0-common","binary_version":"3.0.11.33703.ds4-2ubuntu2"},{"binary_name":"firebird3.0-examples","binary_version":"3.0.11.33703.ds4-2ubuntu2"},{"binary_version":"3.0.11.33703.ds4-2ubuntu2","binary_name":"firebird3.0-server"},{"binary_version":"3.0.11.33703.ds4-2ubuntu2","binary_name":"firebird3.0-server-core"},{"binary_name":"firebird3.0-utils","binary_version":"3.0.11.33703.ds4-2ubuntu2"},{"binary_name":"libfbclient2","binary_version":"3.0.11.33703.ds4-2ubuntu2"},{"binary_version":"3.0.11.33703.ds4-2ubuntu2","binary_name":"libib-util"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27890.json"}},{"package":{"name":"firebird3.0","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/firebird3.0?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.12.ds7-12"],"ecosystem_specific":{"binaries":[{"binary_name":"firebird3.0-common","binary_version":"3.0.12.ds7-12"},{"binary_version":"3.0.12.ds7-12","binary_name":"firebird3.0-examples"},{"binary_name":"firebird3.0-server","binary_version":"3.0.12.ds7-12"},{"binary_n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