{"id":"CVE-2026-123202","title":"libnxml before 0.18.6 Stack-based Buffer Overflow via long multi-byte XML name","summary":"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-cha…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-121"],"vendor":"bakulf","product":"libnxml","affected":["libnxml < 0.18.6"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-11-05T19:04:41.118484Z"},"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:04:52.864Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123202","references":[{"url":"https://github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a"},{"url":"https://github.com/bakulf/libnxml/releases/tag/0.18.6","label":"libnxml 0.18.6 Release Notes"},{"url":"https://github.com/bakulf/libnxml/blob/9272d1cd6fee88fe7fd4fd812736d95a6ba25f2f/src/nxml_parser.c#L952-L958"},{"url":"https://www.vulncheck.com/advisories/libnxml-before-0.18.6-stack-based-buffer-overflow-via-long-multi-byte-xml-name","label":"VulnCheck Advisory: libnxml before 0.18.6 Stack-based Buffer Overflow via long multi-byte XML name"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T22:38:31.502Z","slug":"CVE-2026-123202","body":"## Overview\n\nlibnxml 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.\n\n## Affected\n\n- `libnxml < 0.18.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}