CVE-2026-86143: CWE-192 Integer Coercion Error in xmlsoft libxml2
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.
CVE-2026-86143: CWE-192 Integer Coercion Error in xmlsoft libxml2
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.
CVSS v3.1
Score 6.9medium
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-09-05T04:31:20.849Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a9b9ca2acd9273b4950701b
Added to database: 09/05/2026, 04:37:54 UTC
Last updated: 09/05/2026, 05:52:29 UTC
Views: 4
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