{"id":"UBUNTU-CVE-2026-44983","details":"smallbitvec is a growable bit-vector for Rust, optimized for size. From 1.0.1 to 2.6.0, an integer overflow in the internal capacity calculation of smallbitvec can lead to an undersized heap allocation, resulting in a heap buffer overflow through safe APIs only. This allows memory corruption without requiring unsafe code from the caller. This vulnerability is fixed in 2.6.1.","modified":"2026-05-27T19:15:24.457322428Z","published":"2026-05-26T22:16:00Z","upstream":["CVE-2026-44983"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-44983"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-44983"},{"type":"REPORT","url":"https://github.com/servo/smallbitvec/security/advisories/GHSA-97wc-2hqc-cjgr"}],"affected":[{"package":{"name":"rust-smallbitvec","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/rust-smallbitvec?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-smallbitvec-dev","binary_version":"2.5.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44983.json"}},{"package":{"name":"rust-smallbitvec","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/rust-smallbitvec?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.5.1-1","binary_name":"librust-smallbitvec-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44983.json"}},{"package":{"name":"rust-smallbitvec","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/rust-smallbitvec?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-smallbitvec-dev","binary_version":"2.5.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44983.json"}},{"package":{"name":"rust-smallbitvec","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rust-smallbitvec?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.1-1","2.5.1-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-smallbitvec-dev","binary_version":"2.5.1-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44983.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"},{"type":"Ubuntu","score":"medium"}]}