CVE-2026-42934
NGINX ngx_http_charset_module vulnerability
4.8
MEDIUM
CVSS 3.1
EPSS 0.04%
Description
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.
How to fix CVE-2026-42934
To remediate CVE-2026-42934, upgrade the affected package to a fixed version below.
- —upgrade to 1.28.3-r1 or later
- —upgrade to 1.30.1 or later
- —upgrade to 1.30.1 or later
- —upgrade to 1.18.0-6.1+deb11u6 or later
Is CVE-2026-42934 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1.28.3-r1
- >= 0.3.50, < 1.30.1
- >= 0.3.50, < 1.30.1
- from 0, < 1.18.0-6.1+deb11u6
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| osv | CVSS 3.1 | MEDIUM4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L |