CVE-2026-42533: NGINX Map directive and Regex matching vulnerability

Overview

Severity

High (CVSS 8.1)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Jul

Released

2026-07-19

Last Updated

2026-07-22

EPSS Score

4.45% (percentile: 90.8%)

Detection & Weaponization (1 sources)

Maturity: Exploit

• GitHub PoC: 11 repositories

Affected Products (1)

Other

• 21527-17084

Revision History

• 2026-07-19: Information published.
• 2026-07-20: Information published.
• 2026-07-22: Information published.