CVE-2026-123202
libnxml before 0.18.6 Stack-based Buffer Overflow via long multi-byte XML name
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-121 |
| Vendor | bakulf |
| Product | libnxml |
| Published | Nov 5, 2026 |
| Last Updated | Nov 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
bakulf / libnxml
0 < 0.18.6
References
github.com: https://github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a github.com: https://github.com/bakulf/libnxml/releases/tag/0.18.6 github.com: https://github.com/bakulf/libnxml/blob/9272d1cd6fee88fe7fd4fd812736d95a6ba25f2f/src/nxml_parser.c#L952-L958 vulncheck.com: https://www.vulncheck.com/advisories/libnxml-before-0.18.6-stack-based-buffer-overflow-via-long-multi-byte-xml-name
Credits
Deus Rex