HIGH 8.1 Microsoft PoC
CVE-2026-42533
NGINX Map directive and Regex matching vulnerability
Microsoft Security Update 2026-Jul: NGINX Map directive and Regex matching vulnerability
Affected Products
- azl3 nginx 1.28.3-6 on Azure Linux 3.0
Remediation
$ sudo apt install --only-upgrade nginxReferences
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42533
- https://nvd.nist.gov/vuln/detail/CVE-2026-42533
This high severity vulnerability with a CVSS score of 8.1 was published on 2026-07-14 via Microsoft. 🚨 A public proof-of-concept exploit is available on GitHub. A remediation command is available below. Affected: azl3 nginx 1.28.3-6 on Azure Linux 3.0.
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