CVE-2026-42934CWE-125

NGINX ngx_http_charset_module vulnerability

Medium · published May 13, 2026

CVSS v4.0
6.3
EPSS
1%
Percentile
53.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00731 · 53.8th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-05-13T14:12Z
EPSS history
Timeline
  • 13 MAY 14:12Z
    NGINX ngx_http_charset_module vulnerability
    cvelistv5