{"id":"UBUNTU-CVE-2026-3979","details":"A flaw has been found in quickjs-ng quickjs up to 0.12.1. This affects the function js_iterator_concat_return of the file quickjs.c. This manipulation causes use after free. The attack requires local access. The exploit has been published and may be used. Patch name: daab4ad4bae4ef071ed0294618d6244e92def4cd. Applying a patch is the recommended action to fix this issue.","modified":"2026-05-20T16:25:38.382886039Z","published":"2026-03-12T04:16:00Z","upstream":["CVE-2026-3979"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-3979"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-3979"}],"affected":[{"package":{"name":"quickjs","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/quickjs?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2021.03.27-1","2021.03.27-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libquickjs","binary_version":"2021.03.27-1ubuntu0.1~esm1"},{"binary_version":"2021.03.27-1ubuntu0.1~esm1","binary_name":"quickjs"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3979.json"}},{"package":{"name":"quickjs","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/quickjs?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2024.01.13-5","2025.04.26-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2025.04.26-1","binary_name":"libquickjs"},{"binary_name":"quickjs","binary_version":"2025.04.26-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3979.json"}},{"package":{"name":"quickjs","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/quickjs?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2025.04.26-1","2025.04.26-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libquickjs","binary_version":"2025.04.26-1build1"},{"binary_name":"quickjs","binary_version":"2025.04.26-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3979.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"},{"type":"Ubuntu","score":"medium"}]}