{"id":"CVE-2018-6345","aliases":["EUVD-2018-18103","GHSA-g4fr-ffvg-p5w6","UBUNTU-CVE-2018-6345"],"status":"published","title":"The function number_format is vulnerable to a heap overflow issue when its second argument (...","description":"The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01748,"percentile":0.77988,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122","CWE-787"],"published":"2019-01-15T22:00:00Z","modified":"2026-11-04T02:45:07Z","affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"hhvm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.11.0+dfsg-1","3.11.1+dfsg-1","3.11.1+dfsg-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"hhvm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.21.0+dfsg-2","3.21.0+dfsg-2build1","3.21.0+dfsg-2build2","3.21.0+dfsg-2build3","3.21.0+dfsg-2ubuntu2"]}],"products":[{"vendor":"facebook","product":"hhvm"}],"references":[{"url":"https://github.com/facebook/hhvm/commit/190ffdf6c8b1ec443be202c7d69e63a7e3da25e3","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.html","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-6345"},{"url":"https://github.com/advisories/GHSA-g4fr-ffvg-p5w6"},{"url":"https://ubuntu.com/security/CVE-2018-6345","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-6345","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2018-6345","description":"The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).","status":"published","published":"2019-01-15T22:00:00Z","modified":"2024-08-05T06:01:48.683Z","cwes":["CWE-122"],"updated_at":"2026-11-02T14:35:05.961936Z"}],"euvd":[{"id":"EUVD-2018-18103","description":"The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).","status":"published","published":"2019-01-15T22:00:00Z","modified":"2024-08-05T06:01:48Z","updated_at":"2026-11-03T02:40:08.072854Z"}],"ghsa":[{"id":"GHSA-g4fr-ffvg-p5w6","title":"The function number_format is vulnerable to a heap overflow issue when its second argument (...","description":"The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).","status":"published","published":"2022-05-13T01:16:08Z","modified":"2023-02-01T05:04:38Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:50:10.388803Z"}],"nvd":[{"id":"CVE-2018-6345","description":"The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).","status":"published","published":"2019-01-15T22:29:00.25Z","modified":"2026-06-17T02:01:42.76Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-122","CWE-787"],"updated_at":"2026-11-02T14:04:53.079938Z"}],"osv":[{"id":"CVE-2018-6345","description":"The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).","status":"published","published":"2019-01-15T22:29:00.25Z","modified":"2026-11-04T07:06:55.067920649Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-04T07:32:23.735279Z"},{"id":"UBUNTU-CVE-2018-6345","description":"The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).","status":"published","published":"2019-01-15T22:29:00Z","modified":"2026-04-22T12:02:12.605278Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:18.772093Z"}]}}