{"id":"CVE-2026-33250","aliases":["DEBIAN-CVE-2026-33250","DSA-6173-1","EUVD-2026-14642","GHSA-f76g-6w3f-f6r3","MGASA-2026-0183","UBUNTU-CVE-2026-33250","USN-8754-1","openSUSE-SU-2026:10401-1","openSUSE-SU-2026:20423-1"],"status":"published","title":"Crash when receiving specially-crafted packets","description":"Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00872,"percentile":0.59297,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-121","CWE-20"],"published":"2026-03-21T00:00:00Z","modified":"2026-11-11T02:47:55Z","fixes":[{"ecosystem":"Debian:12","package":"freeciv","fixed_in":["3.0.6-1+deb12u1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"freeciv","fixed_in":["3.1.4+ds-2+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"freeciv","fixed_in":["3.2.4+ds-1"],"sources":["osv"]},{"ecosystem":"Mageia:9","package":"freeciv","fixed_in":["3.0.7-1.2.mga9"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"freeciv","fixed_in":["2.5.3-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"freeciv","fixed_in":["2.5.10-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"freeciv","fixed_in":["2.6.2-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:22.04:LTS","package":"freeciv","fixed_in":["2.6.6-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:24.04:LTS","package":"freeciv","fixed_in":["3.1.0+ds-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"freeciv","fixed_in":["3.2.4-1.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Leap 16.0","package":"freeciv","fixed_in":["3.2.4-bp160.1.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.6-1+deb12u1"}]}],"versions":["3.0.6-1"]},{"source":"osv","ecosystem":"Debian:13","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.4+ds-2+deb13u1"}]}],"versions":["3.1.4+ds-2"]},{"source":"osv","ecosystem":"Debian:14","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.4+ds-1"}]}],"versions":["3.1.4+ds-2","3.2.0+ds-1","3.2.1+ds-1","3.2.1+ds-2","3.2.2+ds-1"]},{"source":"osv","ecosystem":"Debian:12","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.6-1+deb12u1"}]}],"versions":["3.0.6-1"]},{"source":"osv","ecosystem":"Debian:13","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.4+ds-2+deb13u1"}]}],"versions":["3.1.4+ds-2"]},{"source":"osv","ecosystem":"Mageia:9","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.7-1.2.mga9"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.3-1ubuntu0.1~esm1"}]}],"versions":["2.5.1-1","2.5.2-1","2.5.3-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.10-1ubuntu0.1~esm1"}]}],"versions":["2.5.9-1","2.5.10-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.2-1ubuntu0.1~esm1"}]}],"versions":["2.6.0-3","2.6.0-4","2.6.1-1","2.6.2-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.6-1ubuntu0.1~esm1"}]}],"versions":["2.6.3-1","2.6.5-1","2.6.6-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0+ds-1ubuntu0.1~esm1"}]}],"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"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.4+ds-2","3.2.0+ds-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.3-1ubuntu0.1~esm1"}]}],"versions":["2.5.1-1","2.5.2-1","2.5.3-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.10-1ubuntu0.1~esm1"}]}],"versions":["2.5.9-1","2.5.10-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.2-1ubuntu0.1~esm1"}]}],"versions":["2.6.0-3","2.6.0-4","2.6.1-1","2.6.2-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.6-1ubuntu0.1~esm1"}]}],"versions":["2.6.3-1","2.6.5-1","2.6.6-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0+ds-1ubuntu0.1~esm1"}]}],"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"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.4-1.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"freeciv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.4-bp160.1.1"}]}]}],"products":[{"vendor":"longturn","product":"freeciv21"}],"references":[{"url":"https://github.com/longturn/freeciv21/security/advisories/GHSA-f76g-6w3f-f6r3","tags":["x_refsource_CONFIRM","advisory","report"]},{"url":"https://github.com/longturn/freeciv21/commit/ad8e18ca22595529599782b2984bf44df8d69ed6","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/longturn/freeciv21/releases/tag/v3.1.1","tags":["x_refsource_MISC","web","report"]},{"url":"https://redmine.freeciv.org/issues/1955","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33250.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33250","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-33250","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0183.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35257","tags":["report"]},{"url":"https://lists.debian.org/debian-security-announce/2026/msg00082.html","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-33250","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-33250","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8754-1","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-33250","tags":["web"]},{"url":"https://bugzilla.suse.com/1248258","tags":["report"]},{"url":"https://bugzilla.suse.com/1260036","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-33250","title":"Crash when receiving specially-crafted packets","description":"Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.","status":"published","published":"2026-03-23T23:38:02.07Z","modified":"2026-03-24T13:36:23.98Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-20","CWE-121"],"updated_at":"2026-11-02T14:20:08.009733Z"}],"euvd":[{"id":"EUVD-2026-14642","description":"Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.","status":"published","published":"2026-03-23T23:38:02Z","modified":"2026-03-24T13:36:23Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T19:25:30.317985Z"}],"nvd":[{"id":"CVE-2026-33250","description":"Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.","status":"published","published":"2026-03-24T00:16:29.83Z","modified":"2026-06-17T10:37:11.59Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-20","CWE-121"],"updated_at":"2026-11-02T14:12:10.568062Z"}],"osv":[{"id":"CVE-2026-33250","title":"Crash when receiving specially-crafted packets","description":"Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.","status":"published","published":"2026-03-23T23:38:02.07Z","modified":"2026-11-11T13:23:12.886426814Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-121","CWE-20"],"updated_at":"2026-11-11T03:22:28.447808Z"},{"id":"DEBIAN-CVE-2026-33250","description":"Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.","status":"published","published":"2026-03-24T00:16:29.83Z","modified":"2026-10-01T03:03:10.482192691Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:54.587575Z"},{"id":"UBUNTU-CVE-2026-33250","description":"Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.","status":"published","published":"2026-03-24T00:16:00Z","modified":"2026-09-14T22:00:28.276977333Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:16.036833Z"},{"id":"DSA-6173-1","title":"freeciv - security update","status":"published","published":"2026-03-21T00:00:00Z","modified":"2026-03-21T21:31:05.82732Z","updated_at":"2026-11-02T15:46:18.296714Z"},{"id":"MGASA-2026-0183","title":"Updated freeciv packages fix security vulnerabilities","description":"CVE-2026-33250, freeciv crash with a stack overflow when receiving\nspecially-crafted packets. A remote attacker can use this to take down\nany public server. A malicious server can use this to crash the game on\nthe player's machine\n","status":"published","published":"2026-06-10T00:39:41Z","modified":"2026-06-10T00:45:03.824195384Z","updated_at":"2026-11-02T15:49:43.178336Z"},{"id":"openSUSE-SU-2026:10401-1","title":"freeciv-3.2.4-1.1 on GA media","description":"These are all security issues fixed in the freeciv-3.2.4-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-03-22T00:00:00Z","modified":"2026-03-23T08:15:06.893557Z","updated_at":"2026-11-02T16:58:38.415593Z"},{"id":"openSUSE-SU-2026:20423-1","title":"Security update for freeciv","description":"This update for freeciv fixes the following issues:\n\nChanges in freeciv:\n\n- freeciv 3.2.4:\n  * CVE-2026-33250: Fix a vulnerability allowing remote crashing\n    of the server (boo#1260036)\n  * SDL2 client: Fix crash on selecting nation style or nation\n- includes changes from version 3.2.3:\n  * Restore server to sane state after savegame loading failures\n  * Assert unit goto tile validity rather than outright crashing\n  * Improvements to AI players\n  * Client UI tweaks and bug fixes\n  * translation updates\n\n- freeciv 3.2.2, a compatible general bugfix release:\n  * Fix backward compatibility in loading unit actions from a savegame\n  * Fix crashes after continuing game from a savegame\n  * Fix an error after player is added mid-game\n  * Fix various crashes in client, and client UI tweaks\n\n- freeciv 3.2.1, a compatible general bugfix release:\n  * Fixes for units carrying goods\n  * Fix no city being considered capital for a turn after savegame\n    loading\n  * Corrected what situations make it impossible to airlift a unit\n  * Fix culture victory with very high values of culture\n  * Client UI and crash fixes\n","status":"published","published":"2026-03-23T15:34:35Z","modified":"2026-03-29T17:25:19.128174Z","updated_at":"2026-11-02T16:58:41.463445Z"},{"id":"USN-8754-1","title":"freeciv vulnerability","description":"It was discovered that Freeciv incorrectly handled certain network packets,\nresulting in a stack overflow. A remote attacker could possibly use this\nissue to cause Freeciv clients or servers to crash, resulting in a denial\nof service.","status":"published","published":"2026-09-14T12:40:26Z","modified":"2026-09-14T22:12:16.367252549Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}