{"id":"CVE-2026-123202","aliases":["DEBIAN-CVE-2026-123202","EUVD-2026-117647","GHSA-mwvf-r58x-mh9m","UBUNTU-CVE-2026-123202"],"status":"published","title":"libnxml before 0.18.6 Stack-based Buffer Overflow via long multi-byte XML name","description":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00705,"percentile":0.53828,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121"],"published":"2026-11-05T18:16:38Z","modified":"2026-11-07T01:46:30Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.4-1","0.18.4-2","0.18.4-2.1","0.18.4-2.1~exp1","0.18.5-1","0.18.5-2"]},{"source":"osv","ecosystem":"Debian:13","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.5-1","0.18.5-2"]},{"source":"osv","ecosystem":"Debian:14","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.5-1","0.18.5-2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.3-6"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.3-6"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.3-7","0.18.3-8"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.3-8","0.18.4-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.4-1","0.18.4-2","0.18.5-1build1","0.18.5-1build2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.5-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"libnxml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.5-1build2","0.18.5-2"]}],"products":[{"vendor":"bakulf","product":"libnxml"}],"references":[{"url":"https://github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a","tags":["patch","fix","report"]},{"url":"https://github.com/bakulf/libnxml/releases/tag/0.18.6","tags":["release-notes","advisory","report"]},{"url":"https://github.com/bakulf/libnxml/blob/9272d1cd6fee88fe7fd4fd812736d95a6ba25f2f/src/nxml_parser.c#L952-L958","tags":["technical-description","article","report"]},{"url":"https://www.vulncheck.com/advisories/libnxml-before-0.18.6-stack-based-buffer-overflow-via-long-multi-byte-xml-name","tags":["third-party-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123202","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-mwvf-r58x-mh9m"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123202.json","tags":["advisory"]},{"url":"https://github.com/bakulf/libnxml","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-123202","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-123202","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-123202","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-123202","title":"libnxml before 0.18.6 Stack-based Buffer Overflow via long multi-byte XML name","description":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.","status":"published","published":"2026-11-05T18:16:38.397Z","modified":"2026-11-05T19:04:52.864Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"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","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-05T20:54:59.423743Z"}],"euvd":[{"id":"EUVD-2026-117647","description":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.","status":"published","published":"2026-11-05T18:16:38Z","modified":"2026-11-05T19:04:52Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-06T00:02:40.29302Z"}],"ghsa":[{"id":"GHSA-mwvf-r58x-mh9m","title":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c...","description":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.","status":"published","published":"2026-11-05T21:34:50Z","modified":"2026-11-05T21:34:53Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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":"high"},{"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-121"],"updated_at":"2026-11-05T21:56:36.974002Z"}],"nvd":[{"id":"CVE-2026-123202","description":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.","status":"published","published":"2026-11-05T19:17:19.337Z","modified":"2026-11-05T19:17:19.337Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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":"high","assessor":"secondary"},{"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","assessor":"primary"}],"cwes":["CWE-121"],"updated_at":"2026-11-05T21:56:50.099578Z"}],"osv":[{"id":"CVE-2026-123202","title":"libnxml before 0.18.6 Stack-based Buffer Overflow via long multi-byte XML name","description":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.","status":"published","published":"2026-11-05T18:16:38.397Z","modified":"2026-11-07T07:05:09.435888278Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-121"],"updated_at":"2026-11-07T03:08:01.726202Z"},{"id":"DEBIAN-CVE-2026-123202","description":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.","status":"published","published":"2026-11-05T19:17:19.337Z","modified":"2026-11-06T18:00:06.811253417Z","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"}],"updated_at":"2026-11-06T18:35:17.269535Z"},{"id":"UBUNTU-CVE-2026-123202","description":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.","status":"published","published":"2026-11-06T00:00:00Z","modified":"2026-11-07T01:46:30.109339726Z","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"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-07T01:56:47.245871Z"}]}}