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Δ / VULNERABILITY RECORD

CVE-2026-34743.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSMEDIUM / 5.3No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Sep 24, 2026

Disclosure summary

XZ Utils: Buffer overflow in lzma_index_append()

Source-reported weakness categories

CWE-122

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) · 2026-Apr

Open original source · Updated Sep 24, 2026

XZ Utils: Buffer overflow in lzma_index_append()

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

Microsoft maximum product score: 5.3

VendorProduct / associationVersion / bounds
Microsoft update guideazl3 xz 5.4.4-2 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 cmake 3.21.4-23 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 xz 5.2.5-1 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 rust 1.75.0-27 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 xz 5.2.5-1 on CBL-Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 rust 1.72.0-15 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 rust 1.90.0-6 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guideazl3 xz 5.4.4-3 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 cmake 3.21.4-23 (MSRC status code 3)
Microsoft update guidecbl2 cmake 3.21.4-23 on CBL-Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 rust 1.72.0-15 on CBL-Mariner 2.0 (MSRC status code 3)

Vendor remediation references

  • CBL-Mariner Releases · build 5.4.4-3 · product IDs 19442-17084, 21212-17084
  • Vendor guidance · product IDs 19442-17084, 21212-17084
  • CBL-Mariner Releases · build 5.2.5-2 · product IDs 21167-17086
  • Vendor guidance · product IDs 21167-17086
  • CBL-Mariner Releases · build 1.75.0-28 · product IDs 21110-17084
  • Vendor guidance · product IDs 21110-17084
  • Release Notes · build 5.2.5-2 · product IDs 21167-21692
  • Vendor guidance · product IDs 21167-21692
  • CBL-Mariner Releases · build 1.72.0-16 · product IDs 21108-17086
  • Vendor guidance · product IDs 21108-17086
  • CBL-Mariner Releases · build 1.90.0-7 · product IDs 21123-17084
  • Vendor guidance · product IDs 21123-17084
  • Release Notes · product IDs 21120-21692
  • Vendor guidance · product IDs 21120-21692
  • Release Notes · build 1.72.0-16 · product IDs 21108-21692
  • Vendor guidance · product IDs 21108-21692

Original records & references

PUBLISHED 2026-04-03T21:02:38-04:00
MODIFIED 2026-09-24T22:27:30-04:00
INGESTED 2026-10-08T12:45:03-04:00