CVE-2026-86143
HIGH
7.3
CVSS Score
Published: September 5, 2026 at 04:31 AM UTC
Updated: September 15, 2026 at 07:50 PM UTC
1 product affected across 1 vendorLIBXML2
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Severity
HIGH7.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit
Description
In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (3)
Patch
Source: cverecord
https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- LOW
Vector?
Quick Info
StatusANALYZED
CWE
CWE-192
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