CVE-2026-86140 — HIGH (8.0)

Q: What is CVE-2026-86140?

CVE-2026-86140 is a vulnerability with a CVSS score of 8.0 (HIGH). In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

Q: How severe is CVE-2026-86140?

CVE-2026-86140 has been rated HIGH with a CVSS base score of 8.0/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-86140?

Check the references section above for vendor advisories and patch information. Affected products include: Xmlsoft Libxml2.

Vulnerability Description

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

CVSS Score

8.0

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

LOW

Affected Products

Vendor	Product	Versions
Xmlsoft	Libxml2	< 2.15.4

Related Weaknesses (CWE)

CWE-121

References

https://github.com/GNOME/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340Patch
https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4Release Notes

FAQ

What is CVE-2026-86140?

CVE-2026-86140 is a vulnerability with a CVSS score of 8.0 (HIGH). In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

How severe is CVE-2026-86140?

CVE-2026-86140 has been rated HIGH with a CVSS base score of 8.0/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-86140?

Check the references section above for vendor advisories and patch information. Affected products include: Xmlsoft Libxml2.