What’s Vulnerable › Vulnerabilities

CVE-2026-86140

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-05 · updated 2026-09-15
• Weakness: CWE-121

Description

In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

Affected products

• xmlsoft libxml2: before 2.15.4 — fixed in 2.15.4

How to fix

Upgrade to a fixed version: xmlsoft libxml2 2.15.4. Check the vendor advisory for mitigations.

References

• https://github.com/GNOME/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340
• https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4

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