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Δ / VULNERABILITY RECORD

CVE-2025-6021.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSHIGH / 7.5No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Aug 12, 2026

Disclosure summary

Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2

Source-reported weakness categories

CWE-121

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

Microsoft Security Updates (CVRF) · 2025-Jun

Open original source · Updated Aug 12, 2026

Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2

Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.

Microsoft maximum product score: 7.5

VendorProduct / associationVersion / bounds
Microsoft update guidecm2 libxml2 2.10.4-8 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 libxml2 2.11.5-6 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 libxml2 2.10.4-8 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 libxml2 2.10.4-8 on CBL-Mariner 2.0 (MSRC status code 3)

Vendor remediation references

  • CBL-Mariner Releases · build 2.10.4-8 · product IDs 19569-16823, 20212-17086, 20212-21692
  • Vendor guidance · product IDs 19569-16823, 20212-17086, 20212-21692
  • CBL-Mariner Releases · build 2.11.5-6 · product IDs 19618-17084
  • Vendor guidance · product IDs 19618-17084

Original records & references

PUBLISHED 2025-07-28T20:00:00-04:00
MODIFIED 2026-08-12T20:10:19-04:00
INGESTED 2026-10-08T12:50:05-04:00