{"id":"UBUNTU-CVE-2025-8733","details":"A flaw has been found in GNU Bison up to 3.8.2. This affects the function __obstack_vprintf_internal of the file obprintf.c. Executing manipulation can lead to reachable assertion. The attack requires local access. The exploit has been published and may be used. It is still unclear if this vulnerability genuinely exists. The issue could not be reproduced from a GNU Bison 3.8.2 tarball run in a Fedora 42 container.","modified":"2025-10-24T05:16:35Z","published":"2025-08-08T18:15:00Z","withdrawn":"2025-11-06T05:22:36Z","upstream":["CVE-2025-8733"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-8733"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-8733"},{"type":"REPORT","url":"https://github.com/akimd/bison/issues/113"},{"type":"REPORT","url":"https://github.com/akimd/bison/issues/114"},{"type":"REPORT","url":"https://vuldb.com/?ctiid.319229"},{"type":"REPORT","url":"https://vuldb.com/?id.319229"},{"type":"REPORT","url":"https://vuldb.com/?submit.622298"},{"type":"REPORT","url":"https://vuldb.com/?submit.622299"},{"type":"REPORT","url":"https://www.gnu.org/"}],"affected":[{"package":{"name":"bison","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/bison@2:3.0.4.dfsg-1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.0.2.dfsg-2","2:3.0.4.dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"bison","binary_version":"2:3.0.4.dfsg-1"},{"binary_name":"libbison-dev","binary_version":"2:3.0.4.dfsg-1"}],"priority_reason":"Attack on the localhost"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-8733.json"}},{"package":{"name":"bison","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/bison@2:3.0.4.dfsg-1build1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.0.4.dfsg-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"bison","binary_version":"2:3.0.4.dfsg-1build1"},{"binary_name":"libbison-dev","binary_version":"2:3.0.4.dfsg-1build1"}],"priority_reason":"Attack on the localhost"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-8733.json"}},{"package":{"name":"bison","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/bison@2:3.5.1+dfsg-1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.4.1+dfsg-4","2:3.4.2+dfsg-1","2:3.5.1+dfsg-1"],"ecosystem_specific":{"priority_reason":"Attack on the localhost","binaries":[{"binary_name":"bison","binary_version":"2:3.5.1+dfsg-1"},{"binary_name":"libbison-dev","binary_version":"2:3.5.1+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-8733.json"}},{"package":{"name":"bison","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/bison@2:3.8.2+dfsg-1build1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.7.6+dfsg-1build1","2:3.8.2+dfsg-1","2:3.8.2+dfsg-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"bison","binary_version":"2:3.8.2+dfsg-1build1"},{"binary_name":"libbison-dev","binary_version":"2:3.8.2+dfsg-1build1"}],"priority_reason":"Attack on the localhost"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-8733.json"}},{"package":{"name":"bison","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/bison@2:3.8.2+dfsg-1build2?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.8.2+dfsg-1build1","2:3.8.2+dfsg-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"bison","binary_version":"2:3.8.2+dfsg-1build2"},{"binary_version":"2:3.8.2+dfsg-1build2","binary_name":"libbison-dev"}],"priority_reason":"Attack on the localhost"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-8733.json"}},{"package":{"name":"bison","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/bison@2:3.8.2+dfsg-1build3?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.8.2+dfsg-1build2","2:3.8.2+dfsg-1build3"],"ecosystem_specific":{"binaries":[{"binary_name":"bison","binary_version":"2:3.8.2+dfsg-1build3"},{"binary_name":"libbison-dev","binary_version":"2:3.8.2+dfsg-1build3"}],"priority_reason":"Attack on the localhost"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-8733.json"}},{"package":{"name":"bison","ecosystem":"Ubuntu:25.04","purl":"pkg:deb/ubuntu/bison@2:3.8.2+dfsg-1build2?arch=source&distro=plucky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.8.2+dfsg-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"bison","binary_version":"2:3.8.2+dfsg-1build2"},{"binary_name":"libbison-dev","binary_version":"2:3.8.2+dfsg-1build2"}],"priority_reason":"Attack on the localhost"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-8733.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"},{"type":"Ubuntu","score":"low"}]}