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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-42934

24
FAUCET Score

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.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.3.0, <= 4.7.0CPE matchmatch criteria
cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*
4.8.0CPE matchmatch criteria
cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:*
>= 1.3.0, <= 1.6.2CPE matchmatch criteria
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
>= 2.0.0, <= 2.6.0CPE matchmatch criteria
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
>= 3.5.0, <= 3.7.2CPE matchmatch criteria
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
LOW
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.72%
Probability of exploitation in next 30 days
EPSS Percentile
50.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0072 is in the 10th percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: 21341-17084Fixed in: 1.28.3-2
microsoftpatch availablevia msrc
Product: azl3 nginx 1.28.3-1 on Azure Linux 3.0Fixed in: 1.28.3-2
ubuntupatch availablevia ubuntu_usn
Product: nginx (jammy)Fixed in: 1.18.0-6ubuntu14.12
ubuntupatch availablevia ubuntu_usn
Product: nginx (noble)Fixed in: 1.24.0-2ubuntu7.9
ubuntupatch availablevia ubuntu_usn
Product: nginx (questing)Fixed in: 1.28.0-6ubuntu1.4
ubuntupatch availablevia ubuntu_usn
Product: nginx (resolute)Fixed in: 1.28.3-2ubuntu1.2

Vendor Advisories (2)

ubuntuUSN-8354-1

nginx vulnerabilities

Jun 1, 2026
microsoft2026-May/CVE-2026-42934Moderate

NGINX ngx_http_charset_module vulnerability

May 12, 2026

References

my.f5.com / manage/s/article/K000161028
MitigationVendor Advisory