CVE-2026-86140
High
Description
In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.
SeverityHigh
CVSS8.0
Exploit probability—
ProductXmlsoft Libxml2
PublishedSep 5, 2026
First seenSep 5, 2026
Weakness typeCWE-121CWE-121
How to fix
Update
- xmlsoft libxml22.15.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| xmlsoft libxml2 | v < 2.15.4 | 2.15.4 |
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