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CVE-2026-123202libnxml before 0.18.6 Stack-based Buffer Overflow via long multi-byte XML name
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.
8.7 HIGHEPSS 0.70%Not in KEVNVD: Received
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.7 | HIGH | 4.0VulnCheck (CNA) | 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 |
| 7.5 | HIGH | 3.1VulnCheck (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Details
- CVE ID
- CVE-2026-123202
- Status
- Received
- Assigner (CNA)
- VulnCheck
- Published
- Nov 5, 2026
- Last modified
- 2026-11-05 19:17 UTC
- Weaknesses
- CWE-121 · Stack-based Buffer Overflow
Affected Products
As published by the CNA in the CVE record.
bakulflibnxml1 version range
- before 0.18.6
References
- github.com https://github.com/bakulf/libnxml/blob/9272d1cd6fee88fe7fd4fd812736d95a6ba25f2f/src/nxml_parser.c#L952-L958
- github.com https://github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a
- github.com https://github.com/bakulf/libnxml/releases/tag/0.18.6
- vulncheck.com https://www.vulncheck.com/advisories/libnxml-before-0.18.6-stack-based-buffer-overflow-via-long-multi-byte-xml-name