{"id":"CVE-2020-14150","aliases":["DEBIAN-CVE-2020-14150","EUVD-2020-6307","GHSA-wqmg-pp5q-5hqr","JLSEC-2026-117","MGASA-2021-0023","UBUNTU-CVE-2020-14150"],"status":"published","title":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash).","description":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash). NOTE: there is a risk only if Bison is used with untrusted input, and an observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug reports were intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00385,"percentile":0.32903,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2020-06-15T16:52:10Z","modified":"2026-10-26T12:02:26Z","fixes":[{"ecosystem":"Debian:12","package":"bison","fixed_in":["2:3.6.1+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"bison","fixed_in":["2:3.6.1+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"bison","fixed_in":["2:3.6.1+dfsg-1"],"sources":["osv"]},{"ecosystem":"Julia","package":"Bison_jll","fixed_in":["3.8.2+0"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"bison","fixed_in":["3.5.4-1.mga7"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"bison","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.6.1+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"bison","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.6.1+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"bison","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:3.6.1+dfsg-1"}]}]},{"source":"osv","ecosystem":"Julia","package":"Bison_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.8.2+0"}]}]},{"source":"osv","ecosystem":"Mageia:7","package":"bison","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.4-1.mga7"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"bison","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.0.2.dfsg-2","2:3.0.4.dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"bison","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.0.4.dfsg-1build1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"bison","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.4.1+dfsg-4","2:3.4.2+dfsg-1","2:3.5.1+dfsg-1"]}],"products":[{"vendor":"gnu","product":"bison"}],"references":[{"url":"https://lists.gnu.org/archive/html/info-gnu/2020-04/msg00000.html","tags":["x_refsource_MISC","x_transferred","Mailing List","Vendor Advisory","advisory","web","report"]},{"url":"https://bugs.gentoo.org/717936","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-14150"},{"url":"https://github.com/advisories/GHSA-wqmg-pp5q-5hqr"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-14150","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0023.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=27730","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-14150","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-14150","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-14150","description":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash). NOTE: there is a risk only if Bison is used with untrusted input, and an observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug reports were intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.","status":"published","published":"2020-06-15T16:52:10Z","modified":"2024-08-04T12:39:36.138Z","updated_at":"2026-11-02T14:35:46.476719Z"}],"euvd":[{"id":"EUVD-2020-6307","description":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash). NOTE: there is a risk only if Bison is used with untrusted input, and an observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug reports were intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.","status":"published","published":"2020-06-15T16:52:10Z","modified":"2024-08-04T12:39:36Z","updated_at":"2026-11-03T03:07:35.099081Z"}],"ghsa":[{"id":"GHSA-wqmg-pp5q-5hqr","title":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash).","description":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash).","status":"published","published":"2022-05-24T17:20:33Z","modified":"2023-03-09T05:05:53Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T14:54:17.697698Z"}],"nvd":[{"id":"CVE-2020-14150","description":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash). NOTE: there is a risk only if Bison is used with untrusted input, and an observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug reports were intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.","status":"published","published":"2020-06-15T17:15:10.45Z","modified":"2026-06-17T02:54:17.9Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"updated_at":"2026-11-02T14:06:07.249892Z"}],"osv":[{"id":"CVE-2020-14150","description":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash). NOTE: there is a risk only if Bison is used with untrusted input, and an observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug reports were intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.","status":"published","published":"2020-06-15T17:15:10.45Z","modified":"2026-04-16T04:42:21.528765277Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:14.418339Z"},{"id":"DEBIAN-CVE-2020-14150","description":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash). NOTE: there is a risk only if Bison is used with untrusted input, and an observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug reports were intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.","status":"published","published":"2020-06-15T17:15:10.45Z","modified":"2026-10-26T12:02:26.940849072Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:32.862554Z"},{"id":"JLSEC-2026-117","description":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash). NOTE: there is a risk only if Bison is used with untrusted input, and an observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug reports were intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.","status":"published","published":"2026-04-15T19:26:36.482Z","modified":"2026-07-18T00:01:29.478087773Z","cvss":[{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:47:18.159338Z"},{"id":"UBUNTU-CVE-2020-14150","description":"GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash). NOTE: there is a risk only if Bison is used with untrusted input, and an observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug reports were intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.","status":"published","published":"2020-06-15T17:15:00Z","modified":"2026-04-22T12:29:27.95487Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:22.804634Z"},{"id":"MGASA-2021-0023","title":"Updated bison packages fix a security vulnerability","description":"It was discovered that GNU Bison before 3.5.4 allows attackers to cause a\ndenial of service (application crash) (CVE-2020-14150).\n","status":"published","published":"2021-01-14T15:13:25Z","modified":"2026-04-16T04:40:54.971705491Z","updated_at":"2026-11-02T15:49:41.509337Z"}]}}