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Δ / VULNERABILITY RECORD

CVE-2026-21441.

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 Feb 18, 2026

Disclosure summary

urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)

Source-reported weakness categories

CWE-409

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-Jan

Open original source · Updated Feb 18, 2026

urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)

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 guideazl3 tensorflow 2.16.1-9 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guideazl3 python-urllib3 2.0.7-4 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guideazl3 tensorflow 2.16.1-10 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guideazl3 python-urllib3 2.0.7-3 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 python-urllib3 1.26.19-2 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 python-virtualenv 20.26.6-2 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 python-urllib3 1.26.19-3 on CBL Mariner 2.0 (MSRC status code 3)

Vendor remediation references

  • CBL-Mariner Releases · build 2.16.1-10 · product IDs 17667-17084, 20827-17084
  • Vendor guidance · product IDs 17667-17084, 20827-17084
  • CBL-Mariner Releases · build 2.0.7-4 · product IDs 20831-17084, 20807-17084
  • Vendor guidance · product IDs 20831-17084, 20807-17084
  • CBL-Mariner Releases · build 1.26.19-3 · product IDs 20389-17086, 20890-17086
  • Vendor guidance · product IDs 20389-17086, 20890-17086

Original records & references

PUBLISHED 2026-01-08T20:10:35-05:00
MODIFIED 2026-02-18T20:13:26-05:00
INGESTED 2026-10-08T12:45:21-04:00