CVE intelligence

CVE-2026-42934

Vulnerability intelligence

Published May 13, 2026Sources checked Nov 13, 2026

4.8MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-42934 and is rated Medium severity with a CVSS score of 4.8. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: May 17, 2026

CBL-Mariner Releases

Vendor-listed releases

1.28.3-2

CISA KEVNot listedBased on the latest collected catalog

EPSS0.7%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-42934?

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module.

When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Source: NVD