{"id":"UBUNTU-CVE-2026-90557","details":"Freeciv versions 3.1.0 through 3.2.5 contain an out-of-bounds read vulnerability in sg_load_player_unit() when processing savegame files with invalid unit activity indices. An attacker can craft a malicious savegame file with an out-of-range activity index that bypasses bounds checking and causes a crash or limited heap memory exposure when loaded.","modified":"2026-09-16T11:44:18Z","published":"2026-09-12T18:16:00Z","upstream":["CVE-2026-90557"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-90557"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-90557"},{"type":"REPORT","url":"https://redmine.freeciv.org/issues/2162"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L4282"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L6108"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv/commit/ef0c76c2765fe383140eb1a70dbea1228844152e"},{"type":"REPORT","url":"https://github.com/freeciv/freeciv/releases/tag/R3_2_6"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/freeciv-3.1.0-through-3.2.5-out-of-bounds-read-via-savegame"}],"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_version":"2.5.3-1ubuntu0.1~esm1","binary_name":"freeciv"},{"binary_name":"freeciv-client-extras","binary_version":"2.5.3-1ubuntu0.1~esm1"},{"binary_name":"freeciv-client-gtk","binary_version":"2.5.3-1ubuntu0.1~esm1"},{"binary_version":"2.5.3-1ubuntu0.1~esm1","binary_name":"freeciv-client-qt"},{"binary_version":"2.5.3-1ubuntu0.1~esm1","binary_name":"freeciv-client-sdl"},{"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-2026-90557.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_version":"2.5.10-1ubuntu0.1~esm1","binary_name":"freeciv"},{"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_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_name":"freeciv-client-sdl"},{"binary_version":"2.5.10-1ubuntu0.1~esm1","binary_name":"freeciv-data"},{"binary_name":"freeciv-server","binary_version":"2.5.10-1ubuntu0.1~esm1"},{"binary_name":"freeciv-sound-standard","binary_version":"2.5.10-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90557.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_name":"freeciv-client-extras","binary_version":"2.6.2-1ubuntu0.1~esm1"},{"binary_version":"2.6.2-1ubuntu0.1~esm1","binary_name":"freeciv-client-gtk"},{"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_name":"freeciv-server","binary_version":"2.6.2-1ubuntu0.1~esm1"},{"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-2026-90557.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_name":"freeciv","binary_version":"2.6.6-1ubuntu0.1~esm1"},{"binary_version":"2.6.6-1ubuntu0.1~esm1","binary_name":"freeciv-client-extras"},{"binary_version":"2.6.6-1ubuntu0.1~esm1","binary_name":"freeciv-client-gtk"},{"binary_version":"2.6.6-1ubuntu0.1~esm1","binary_name":"freeciv-client-gtk3"},{"binary_name":"freeciv-client-qt","binary_version":"2.6.6-1ubuntu0.1~esm1"},{"binary_name":"freeciv-client-sdl","binary_version":"2.6.6-1ubuntu0.1~esm1"},{"binary_version":"2.6.6-1ubuntu0.1~esm1","binary_name":"freeciv-data"},{"binary_name":"freeciv-server","binary_version":"2.6.6-1ubuntu0.1~esm1"},{"binary_name":"freeciv-sound-standard","binary_version":"2.6.6-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90557.json"}},{"package":{"name":"freeciv","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.8-1","3.0.8-2","3.0.8-2build1","3.1.0+ds-1build3","3.1.0+ds-1build4","3.1.0+ds-1build5","3.1.0+ds-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.1.0+ds-1ubuntu0.1~esm1","binary_name":"freeciv"},{"binary_name":"freeciv-client-extras","binary_version":"3.1.0+ds-1ubuntu0.1~esm1"},{"binary_version":"3.1.0+ds-1ubuntu0.1~esm1","binary_name":"freeciv-client-gtk3"},{"binary_name":"freeciv-client-qt","binary_version":"3.1.0+ds-1ubuntu0.1~esm1"},{"binary_version":"3.1.0+ds-1ubuntu0.1~esm1","binary_name":"freeciv-client-sdl"},{"binary_name":"freeciv-data","binary_version":"3.1.0+ds-1ubuntu0.1~esm1"},{"binary_version":"3.1.0+ds-1ubuntu0.1~esm1","binary_name":"freeciv-ruleset-tools"},{"binary_version":"3.1.0+ds-1ubuntu0.1~esm1","binary_name":"freeciv-server"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90557.json"}},{"package":{"name":"freeciv","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/freeciv?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.0+ds-1","3.2.1+ds-1","3.2.1+ds-1build1","3.2.2+ds-1","3.2.4+ds-1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.2.4+ds-1","binary_name":"freeciv"},{"binary_name":"freeciv-client-extras","binary_version":"3.2.4+ds-1"},{"binary_name":"freeciv-client-gtk3","binary_version":"3.2.4+ds-1"},{"binary_version":"3.2.4+ds-1","binary_name":"freeciv-client-gtk4"},{"binary_name":"freeciv-client-qt","binary_version":"3.2.4+ds-1"},{"binary_name":"freeciv-client-sdl","binary_version":"3.2.4+ds-1"},{"binary_name":"freeciv-data","binary_version":"3.2.4+ds-1"},{"binary_name":"freeciv-ruleset-tools","binary_version":"3.2.4+ds-1"},{"binary_name":"freeciv-server","binary_version":"3.2.4+ds-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90557.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}