{"id":"CVE-2026-123202","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-123202","summary":"libnxml before 0.18.6 Stack-based Buffer Overflow via long multi-byte XML name","details":"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.","published":"2026-11-05T18:16:38.397Z","modified":"2026-11-06T13:06:01.189006147Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a","label":"bakulf/libnxml@fbac242"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123202.json"},{"type":"PACKAGE","url":"https://github.com/bakulf/libnxml"},{"type":"ARTICLE","url":"https://github.com/bakulf/libnxml/blob/9272d1cd6fee88fe7fd4fd812736d95a6ba25f2f/src/nxml_parser.c#L952-L958"},{"type":"FIX","url":"https://github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a"},{"type":"ADVISORY","url":"https://github.com/bakulf/libnxml/releases/tag/0.18.6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123202"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/libnxml-before-0.18.6-stack-based-buffer-overflow-via-long-multi-byte-xml-name"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-11-06T13:06:01.189006147Z"}}