{"id":"CVE-2021-33642","aliases":["EUVD-2021-20319","GHSA-q8mx-78gm-98mh","OESA-2023-1033"],"status":"published","title":"When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.","description":"When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00227,"percentile":0.13552,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-835"],"published":"2023-01-13T11:05:30Z","modified":"2026-08-18T01:17:28Z","affected":[{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP1","package":"byacc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.20200330-2.oe1"}]}],"bundled":2},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP3","package":"byacc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.20200330-2.oe1"}]}],"bundled":2},{"source":"osv","ecosystem":"openEuler:22.03-LTS","package":"byacc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.20210808-4.oe2203sp1"}]}],"bundled":2},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP1","package":"byacc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.20210808-4.oe2203sp1"}]}],"bundled":2}],"products":[{"vendor":"openeuler","product":"byacc"}],"references":[{"url":"https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4d","tags":["x_transferred","Permissions Required","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33642","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-q8mx-78gm-98mh"},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1033","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33641","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2021-33642","description":"When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.","status":"published","published":"2023-01-20T00:00:00Z","modified":"2025-04-02T14:47:37.73Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"adp"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T14:33:10.555814Z"}],"euvd":[{"id":"EUVD-2021-20319","description":"When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.","status":"published","published":"2023-01-20T00:00:00Z","modified":"2025-04-02T14:47:37Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T20:52:44.834568Z"}],"ghsa":[{"id":"GHSA-q8mx-78gm-98mh","title":"When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.","description":"When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.","status":"published","published":"2023-01-20T21:30:26Z","modified":"2023-02-02T18:30:30Z","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-835"],"updated_at":"2026-11-02T14:52:47.451891Z"}],"nvd":[{"id":"CVE-2021-33642","description":"When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.","status":"published","published":"2023-01-20T21:15:11.043Z","modified":"2026-06-17T03:54:56.923Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T14:07:07.323379Z"}],"osv":[{"id":"OESA-2023-1033","title":"byacc security update","description":"Berkeley Yacc is an LALR(1) parser generator.  Berkeley Yacc has been made as compatible as possible with AT\u0026amp;T Yacc.  Berkeley Yacc can accept any input specification that conforms to the AT\u0026amp;T Yacc documentation.  Specifications that take advantage of undocumented features of AT\u0026amp;T Yacc will probably be rejected.\r\n\r\nSecurity Fix(es):\r\n\r\nNo description is available for this CVE.(CVE-2021-33641)\r\n\r\nNo description is available for this CVE.(CVE-2021-33642)","status":"published","published":"2023-01-13T11:05:30Z","modified":"2026-08-18T01:17:28.701091274Z","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":"2026-11-02T15:52:39.934788Z"}]}}