{"id":"CVE-2025-6498","aliases":["AZL-64314","AZL-64320","DEBIAN-CVE-2025-6498","EUVD-2025-18861","GHSA-449v-6j3r-mxhj","UBUNTU-CVE-2025-6498"],"status":"published","title":"HTACG tidy-html5 alloc.c defaultAlloc memory leak","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","severity":{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00239,"percentile":0.15014,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-401","CWE-404"],"published":"2025-06-23T01:31:05Z","modified":"2026-11-05T05:40:51Z","affected":[{"source":"osv","ecosystem":"Azure Linux:2","package":"tidy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"5.8.0-6"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"tidy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"5.8.0-6"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.6.0-11","2:5.7.45-1~exp1","2:5.8.0-1","2:5.8.0-1~exp1","2:5.8.0-1~exp2","2:5.8.0-2","2:5.8.0-2.1"]},{"source":"osv","ecosystem":"Debian:13","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.8.0-2","2:5.8.0-2.1"]},{"source":"osv","ecosystem":"Debian:14","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.8.0-2","2:5.8.0-2.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:5.2.0-2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.6.0-10","2:5.6.0-11","2:5.6.0-11ubuntu0.20.04.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.6.0-11build1","2:5.6.0-11build2","2:5.6.0-11ubuntu0.22.04.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.6.0-11build2","2:5.6.0-11ubuntu1","2:5.6.0-11ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.8.0-1ubuntu1","2:5.8.0-2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.8.0-2.1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"tidy-html5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.8.0-2","2:5.8.0-2.1"]}],"products":[{"vendor":"htacg","product":"tidy"},{"vendor":"htacg","product":"tidy-html5"}],"references":[{"url":"https://vuldb.com/?id.313614","tags":["vdb-entry","technical-description","Third Party Advisory","VDB Entry","advisory","report"]},{"url":"https://vuldb.com/?ctiid.313614","tags":["signature","permissions-required","Permissions Required","VDB Entry","report"]},{"url":"https://vuldb.com/?submit.601009","tags":["third-party-advisory","Third Party Advisory","VDB Entry","advisory","report"]},{"url":"https://github.com/htacg/tidy-html5/issues/1152","tags":["issue-tracking","exploit","Exploit","Issue Tracking","report"]},{"url":"https://github.com/user-attachments/files/20438303/tidy-html5_crash_3.txt","tags":["exploit","Exploit","evidence","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-6498","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-449v-6j3r-mxhj"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/6xxx/CVE-2025-6498.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-6498","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-6498","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-6498","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-6498","title":"HTACG tidy-html5 alloc.c defaultAlloc memory leak","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-23T01:31:05.868Z","modified":"2025-06-23T13:45:07.073Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","level":"low","assessor":"cna"},{"version":"3.0","score":3.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","level":"low","assessor":"cna"},{"version":"2.0","score":1.7,"vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR","assessor":"cna"}],"cwes":["CWE-401","CWE-404"],"updated_at":"2026-11-02T14:32:40.774223Z"}],"euvd":[{"id":"EUVD-2025-18861","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-23T01:31:05Z","modified":"2025-06-23T13:45:07Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium"}],"updated_at":"2026-11-02T20:32:18.218874Z"}],"ghsa":[{"id":"GHSA-449v-6j3r-mxhj","title":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is...","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-23T03:30:30Z","modified":"2025-06-23T03:30:39Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-401"],"updated_at":"2026-11-02T15:02:48.223406Z"}],"nvd":[{"id":"CVE-2025-6498","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-23T02:15:20.703Z","modified":"2026-06-17T10:02:01.4Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"},{"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":1.7,"vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P","level":"low","assessor":"secondary"}],"cwes":["CWE-401","CWE-404"],"updated_at":"2026-11-02T14:11:14.091082Z"}],"osv":[{"id":"CVE-2025-6498","title":"HTACG tidy-html5 alloc.c defaultAlloc memory leak","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-23T01:31:05.868Z","modified":"2026-10-28T02:31:14.546933472Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-401","CWE-404"],"updated_at":"2026-11-02T15:44:51.851511Z"},{"id":"DEBIAN-CVE-2025-6498","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-23T02:15:20.703Z","modified":"2026-09-01T20:05:55.781147788Z","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":"2026-11-02T15:45:47.697959Z"},{"id":"UBUNTU-CVE-2025-6498","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-23T02:15:00Z","modified":"2026-10-17T12:57:11.303129227Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","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"},{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"updated_at":"2026-11-02T16:55:52.345622Z"},{"id":"AZL-64314","title":"CVE-2025-6498 affecting package tidy 5.8.0-6","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-23T02:15:20Z","modified":"2026-04-21T04:32:21.442967Z","updated_at":"2026-11-02T15:28:07.805289Z"},{"id":"AZL-64320","title":"CVE-2025-6498 affecting package tidy 5.8.0-6","description":"A vulnerability classified as problematic has been found in HTACG tidy-html5 5.8.0. Affected is the function defaultAlloc of the file src/alloc.c. The manipulation leads to memory leak. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-23T02:15:20Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:21.518778Z"}]}}