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CVE-2026-42934

NGINX ngx_http_charset_module vulnerability

Published: May 13, 2026Updated: Jun 18, 2026 Sources: CVE List NVD BDUCWE-125
NVD MITRE
4.8CVSSMEDIUM
EPSS Score
0.7%
Top 51.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:LI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-125

Affected Products

NGINX PlusF5
On-premWeb App
Networking Infrastructure / load-balancer-proxy
NGINX Open SourceF5
On-premWeb App
Networking Infrastructure / load-balancer-proxy
АЛЬТ СП 10АО «ИВК»
On-premOS
Operating Systems / linux-distro
NGINX PlusNGINX Inc.Networking Infrastructure
NGINX Open SourceNGINX Inc.Networking Infrastructure
f5commercialUSNetworking Infrastructure
ао «ивк»commercialRUOperating Systemsaka ivk
nginx inc.commercialUSNetworking Infrastructureaka nginx, nginx plus, njs
and 16 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://my.f5.com/manage/s/article/K000161028
my.f5.com
https://my.f5.com/manage/s/article/K000161028
my.f5.com
https://angie.software/angie/docs/pro_changes/
angie.software
and 2 more references View all →

Timeline

Published
May 13, 2026
Last Updated
Jun 18, 2026

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