{"id":"UBUNTU-CVE-2026-90556","details":"Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.","modified":"2026-09-16T11:44:18Z","published":"2026-09-12T18:16:00Z","upstream":["CVE-2026-90556"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-90556"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-90556"},{"type":"REPORT","url":"https://redmine.freeciv.org/issues/2161"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L788"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L964"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv/commit/75ecde3e86ddf2fe775768450e9a290a4f4d4387"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv/releases/tag/R3_2_6"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/freeciv-before-3.2.6-heap-buffer-overflow-via-worklist-load"}],"affected":[{"package":{"name":"freeciv","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.1-1","2.5.2-1","2.5.3-1","2.5.3-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"freeciv","binary_version":"2.5.3-1ubuntu0.1~esm1"},{"binary_name":"freeciv-client-extras","binary_version":"2.5.3-1ubuntu0.1~esm1"},{"binary_version":"2.5.3-1ubuntu0.1~esm1","binary_name":"freeciv-client-gtk"},{"binary_name":"freeciv-client-qt","binary_version":"2.5.3-1ubuntu0.1~esm1"},{"binary_name":"freeciv-client-sdl","binary_version":"2.5.3-1ubuntu0.1~esm1"},{"binary_name":"freeciv-data","binary_version":"2.5.3-1ubuntu0.1~esm1"},{"binary_name":"freeciv-server","binary_version":"2.5.3-1ubuntu0.1~esm1"},{"binary_name":"freeciv-sound-standard","binary_version":"2.5.3-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json"}},{"package":{"name":"freeciv","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.9-1","2.5.10-1","2.5.10-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"freeciv","binary_version":"2.5.10-1ubuntu0.1~esm1"},{"binary_name":"freeciv-client-extras","binary_version":"2.5.10-1ubuntu0.1~esm1"},{"binary_name":"freeciv-client-gtk","binary_version":"2.5.10-1ubuntu0.1~esm1"},{"binary_name":"freeciv-client-gtk3","binary_version":"2.5.10-1ubuntu0.1~esm1"},{"binary_name":"freeciv-client-qt","binary_version":"2.5.10-1ubuntu0.1~esm1"},{"binary_version":"2.5.10-1ubuntu0.1~esm1","binary_name":"freeciv-client-sdl"},{"binary_name":"freeciv-data","binary_version":"2.5.10-1ubuntu0.1~esm1"},{"binary_name":"freeciv-server","binary_version":"2.5.10-1ubuntu0.1~esm1"},{"binary_version":"2.5.10-1ubuntu0.1~esm1","binary_name":"freeciv-sound-standard"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json"}},{"package":{"name":"freeciv","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.0-3","2.6.0-4","2.6.1-1","2.6.2-1","2.6.2-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"freeciv","binary_version":"2.6.2-1ubuntu0.1~esm1"},{"binary_version":"2.6.2-1ubuntu0.1~esm1","binary_name":"freeciv-client-extras"},{"binary_name":"freeciv-client-gtk","binary_version":"2.6.2-1ubuntu0.1~esm1"},{"binary_name":"freeciv-client-gtk3","binary_version":"2.6.2-1ubuntu0.1~esm1"},{"binary_version":"2.6.2-1ubuntu0.1~esm1","binary_name":"freeciv-client-qt"},{"binary_name":"freeciv-client-sdl","binary_version":"2.6.2-1ubuntu0.1~esm1"},{"binary_name":"freeciv-data","binary_version":"2.6.2-1ubuntu0.1~esm1"},{"binary_version":"2.6.2-1ubuntu0.1~esm1","binary_name":"freeciv-server"},{"binary_name":"freeciv-sound-standard","binary_version":"2.6.2-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json"}},{"package":{"name":"freeciv","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.3-1","2.6.5-1","2.6.6-1","2.6.6-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.6.6-1ubuntu0.1~esm1","binary_name":"freeciv"},{"binary_name":"freeciv-client-extras","binary_version":"2.6.6-1ubuntu0.1~esm1"},{"binary_version":"2.6.6-1ubuntu0.1~esm1","binary_name":"freeciv-client-gtk"},{"binary_name":"freeciv-client-gtk3","binary_version":"2.6.6-1ubuntu0.1~esm1"},{"binary_version":"2.6.6-1ubuntu0.1~esm1","binary_name":"freeciv-client-qt"},{"binary_name":"freeciv-client-sdl","binary_version":"2.6.6-1ubuntu0.1~esm1"},{"bina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