CVE-2026-86143: xmlsoft libxml2 vulnerability
xmlsoft · libxml2
Fixed in 2.15.4 · Affected: xmlsoft libxml2 before 2.15.4 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 9% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- xmlsoft · libxml2before 2.15.4
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- xmlsoft
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-86143 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.