CVE-2026-86143
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- CVE-2026-86143
CVE Details
| Release Date: | 2026-09-05 | |
| Impact: | Moderate | What is this? |
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.
See more information about CVE-2026-86143 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 metrics
| Base Score: | 6.9 |
| Vector String: | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L |
| Version: | 3.1 |
| Attack Vector: | Local |
| Attack Complexity: | High |
| Privileges Required: | None |
| User Interaction: | None |
| Scope: | Unchanged |
| Confidentiality Impact: | High |
| Integrity Impact: | High |
| Availability Impact: | Low |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 10 (libxml2) | ELSA-2026-71586 | 2026-09-25 |
| Oracle Linux version 8 (libxml2) | ELSA-2026-71641 | 2026-09-25 |
| Oracle Linux version 9 (libxml2) | ELSA-2026-71585 | 2026-09-24 |
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