What is CVE-2026-55553?

CVE-2026-55553 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. urllib: Cross-origin redirects preserve credential-bearing request headers, leading to potential credential leakage

Which CVE IDs does CVE-2026-55553 cover?

CVE-2026-55553 covers the following CVE IDs: CVE-2026-55553. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-55553?

CVE-2026-55553 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-55553?

CVE-2026-55553 affects 1 product, including: azl3 python-urllib3 2.0.7-6 on Azure Linux 3.0.

CVE-2026-55553HighCVSS 7.5

urllib: Cross-origin redirects preserve credential-bearing request headers, leading to potential credential leakage

Vendor

Microsoft Security Response Center (MSRC)

Published

October 21, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-55553 →

🎯 Affected products1

azl3 python-urllib3 2.0.7-6 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55553
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade