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Δ / VULNERABILITY RECORD

CVE-2026-62899.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSMEDIUM / 5.9No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Aug 11, 2026

Disclosure summary

Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

Source-reported weakness categories

CWE-444

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-Aug

Open original source · Updated Aug 11, 2026

.NET Security Feature Bypass Vulnerability

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

Microsoft maximum product score: 5.9

VendorProduct / associationVersion / bounds
Microsoft update guide.NET 10.0 installed on Mac OS (MSRC status code 3)
Microsoft update guide.NET 10.0 installed on Linux (MSRC status code 3)
Microsoft update guide.NET 8.0 installed on Windows (MSRC status code 3)
Microsoft update guide.NET 8.0 installed on Linux (MSRC status code 3)
Microsoft update guide.NET 8.0 installed on Mac OS (MSRC status code 3)
Microsoft update guide.NET 9.0 installed on Linux (MSRC status code 3)
Microsoft update guide.NET 9.0 installed on Mac OS (MSRC status code 3)
Microsoft update guide.NET 9.0 installed on Windows (MSRC status code 3)
Microsoft update guideMicrosoft Visual Studio 2022 version 17.14 (MSRC status code 3)
Microsoft update guideMicrosoft Visual Studio 2026 version 18.8 (MSRC status code 3)

Vendor remediation references

  • 5122106 · build 10.0.11 · product IDs 20838, 20839
  • Vendor guidance · product IDs 20838, 20839
  • 5122104 · build 8.0.30 · product IDs 12414, 12415, 12416
  • Vendor guidance · product IDs 12414, 12415, 12416
  • 5122105 · build 9.0.19 · product IDs 12432, 12433, 12434
  • Vendor guidance · product IDs 12432, 12433, 12434
  • Vendor guidance · build 17.14.38 · product IDs 16767
  • Vendor guidance · product IDs 16767
  • Vendor guidance · build 18.8.3 · product IDs 21681
  • Vendor guidance · product IDs 21681

Original records & references

PUBLISHED 2026-08-11T03:00:00-04:00
MODIFIED 2026-08-11T03:00:00-04:00
INGESTED 2026-10-08T12:40:36-04:00