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Δ / VULNERABILITY RECORD

CVE-2025-4565.

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 Aug 12, 2026

Disclosure summary

Unbounded recursion in Python Protobuf

Source-reported weakness categories

CWE-674

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

Unbounded recursion in Python Protobuf

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 guidecm2 protobuf 3.17.3-4 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 protobuf 25.3-5 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 protobuf 3.17.3-4 on CBL-Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 protobuf 3.17.3-4 on CBL Mariner 2.0 (MSRC status code 3)

Vendor remediation references

  • CBL-Mariner Releases · build 3.17.3-4 · product IDs 19556-16823, 20332-21692, 20332-17086
  • Vendor guidance · product IDs 19556-16823, 20332-21692, 20332-17086
  • CBL-Mariner Releases · build 25.3-5 · product IDs 19602-17084
  • Vendor guidance · product IDs 19602-17084

Original records & references

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