What is CVE-2026-58055?

CVE-2026-58055 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length

Which CVE IDs does CVE-2026-58055 cover?

CVE-2026-58055 covers the following CVE IDs: CVE-2026-58055. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-58055?

CVE-2026-58055 has a CVSS v3 base score of 5.4, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-58055?

CVE-2026-58055 affects 1 product, including: azl4 nghttp2 1.66.0-9.azl4 on Azure Linux 4.0.

CVE-2026-58055MediumCVSS 5.4

nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length

Vendor

Microsoft Security Response Center (MSRC)

Published

June 30, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-58055 →

🎯 Affected products1

azl4 nghttp2 1.66.0-9.azl4 on Azure Linux 4.0

✅ Remediation

KBRelease Notes (Security Update) — fixed build 0:1.66.0-9.azl4

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58055
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade