CVE-2026-123202

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductBakulf Libnxml

PublishedNov 5, 2026

First seenNov 5, 2026

Weakness typeCWE-121CWE-121

How to fix

Update

bakulf libnxml0.18.6 or later

Patches

github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a

Vendor advisories

github.com/bakulf/libnxml/releases/tag/0.18.6

Affected products

Product	Affected versions	Fixed in
bakulf libnxml	v < 0.18.6	0.18.6

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