{"id":"CVE-2019-12495","aliases":["DEBIAN-CVE-2019-12495","EUVD-2019-4091","GHSA-pv69-3373-mhhq","UBUNTU-CVE-2019-12495"],"status":"published","title":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source...","description":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.","severity":{"version":"3.0","score":5.5,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01218,"percentile":0.68843,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2019-05-31T10:45:28Z","modified":"2026-09-21T07:02:16Z","fixes":[{"ecosystem":"Debian:12","package":"tcc","fixed_in":["0.9.27+git20200814.62c30a4a-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"tcc","fixed_in":["0.9.27+git20200814.62c30a4a-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"tcc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.27+git20200814.62c30a4a-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"tcc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.27+git20200814.62c30a4a-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"tcc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.27~git20140923.9d7fb33-3ubuntu1","0.9.27~git20151227.933c223-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"tcc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.27~git20161217.cd9514ab-3ubuntu1","0.9.27-2","0.9.27-4","0.9.27-5"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"tcc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.27-8"]}],"products":[{"vendor":"tinycc","product":"tinycc"}],"references":[{"url":"https://lists.nongnu.org/archive/html/tinycc-devel/2019-05/msg00044.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","report"]},{"url":"https://repo.or.cz/tinycc.git/commit/d04ce7772c2bc2781ab2502e0b1f1964488814b5","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"http://www.securityfocus.com/bid/108541","tags":["vdb-entry","x_refsource_BID","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-12495"},{"url":"https://github.com/advisories/GHSA-pv69-3373-mhhq"},{"url":"https://security-tracker.debian.org/tracker/CVE-2019-12495","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2019-12495","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-12495","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2019-12495","description":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.","status":"published","published":"2019-05-31T10:45:28Z","modified":"2024-08-04T23:24:38.393Z","updated_at":"2026-11-02T14:20:24.025419Z"}],"euvd":[{"id":"EUVD-2019-4091","description":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.","status":"published","published":"2019-05-31T10:45:28Z","modified":"2024-08-04T23:24:38Z","updated_at":"2026-11-03T02:40:45.973526Z"}],"ghsa":[{"id":"GHSA-pv69-3373-mhhq","title":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source...","description":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.","status":"published","published":"2022-05-24T16:46:55Z","modified":"2024-04-04T00:50:00Z","cvss":[{"version":"3.0","score":5.5,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:55:52.724602Z"}],"nvd":[{"id":"CVE-2019-12495","description":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.","status":"published","published":"2019-05-31T11:29:02.623Z","modified":"2026-06-17T02:14:45.903Z","cvss":[{"version":"3.0","score":5.5,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:05:14.729983Z"}],"osv":[{"id":"CVE-2019-12495","description":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.","status":"published","published":"2019-05-31T11:29:02.623Z","modified":"2026-03-14T09:32:23.040749Z","cvss":[{"version":"3.0","score":5.5,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:10.718934Z"},{"id":"DEBIAN-CVE-2019-12495","description":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.","status":"published","published":"2019-05-31T11:29:02.623Z","modified":"2026-09-21T07:02:16.684310096Z","cvss":[{"version":"3.0","score":5.5,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:31.467893Z"},{"id":"UBUNTU-CVE-2019-12495","description":"An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.","status":"published","published":"2019-05-31T11:29:00Z","modified":"2026-04-22T12:08:54.757805Z","cvss":[{"version":"3.0","score":5.5,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:19.202697Z"}]}}