NVD

CVE-2026-48142 Detail

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When content is served or proxied through a location block with both source_charset utf-8; and a charset directive (for example, charset koi8-r;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their 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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: F5 Networks

CVSS-B 6.3 MEDIUM

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS 3.x Severity and Vector Strings:

CNA: F5 Networks

Base Score: 4.8 MEDIUM

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://my.f5.com/manage/s/article/K000161585	F5 Networks	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-125	Out-of-bounds Read	F5 Networks

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Reanalysis by NIST 8/11/2026 11:03:44 AM

Action

Type

Old Value

New Value

Changed

CPE Configuration

OR
          *cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (including) 4.0.1
          *cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* versions from (including) 1.3.0 up to (including) 1.6.2
          *cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (including) 3.7.2
          *cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:* versions from (including) 4.3.0 up to (including) 4.7.0
          *cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*
          *cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (including) 2.6.3
          *cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* versions from (including) 5.0.0 up to (including) 5.5.0
          *cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* versions from (including) 2.17.0 up to (including) 2.22.0
          *cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* versions from (including) 1.0.0 up to (including) 1.30.2
          *cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* versions from (including) 1.31.0 up to (including) 1.31.1
          *cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* versions from (including) 37.0.0 up to (including) 37.0.1
          *cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* versions from (including) r33 up to (including) r36
          *cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* versions from (including) 4.10.0 up to (including) 4.16.0
          *cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* versions from (including) 5.2.0 up to (including) 5.8.0
          *cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* versions from (including) 5.9.0 up to (including) 5.13.1

Record truncated, showing 2048 of 2157 characters.
View Entire Change Record

OR
          *cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* versions from (including) 1.3.0 up to (including) 1.6.2
          *cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:* versions from (including) 4.3.0 up to (including) 4.7.0
          *cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*
          *cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (including) 2.6.3
          *cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* versions from (including) 2.17.0 up to (including) 2.22.0
          *cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* versions from (including) 1.0.0 up to (including) 1.30.2
          *cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* versions from (including) 1.31.0 up to (including) 1.31.1
          *cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* versions from (including) 4.10.0 up to (including) 4.16.0
          *cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* versions from (including) 5.2.0 up to (including) 5.8.0
          *cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* versions from (including) 5.9.0 up to (including) 5.13.1
          *cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:* versions from (including) 3.5.0 up to (including) 3.7.2
          *cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:* versions from (including) r33 up to (excluding) r36
          *cpe:2.3:a:f5:nginx_plus:r36:-:*:*:continuous_releases:*:*:*
          *cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:continuous_releases:*:*:*
          *cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:continuous_releases:*:*:*
          *cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:continuous_releases:*:*:*
          *cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:continuous_releases:*:*:*
          *cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:* versions from (including) 4.0.0 up to (including) 4.0.1
          *cpe:2.3:a:f5:nginx_plus:*:*:*:*:long-term_support:*:*:* versions from (including) 37.0.0.1 up to (excluding) 37.0.2.1
          *cpe:2.3:a:f5:nginx_plus:r36:p5:*:*:continuous_releases:*:*:*
          *cpe:2.3:a:f5:nginx

Initial Analysis by NIST 6/22/2026 12:50:00 PM

Action

Type

Old Value

New Value

Added

CPE Configuration

OR
          *cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (including) 4.0.1
          *cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* versions from (including) 1.3.0 up to (including) 1.6.2
          *cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (including) 3.7.2
          *cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:* versions from (including) 4.3.0 up to (including) 4.7.0
          *cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*
          *cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (including) 2.6.3
          *cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* versions from (including) 5.0.0 up to (including) 5.5.0
          *cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* versions from (including) 2.17.0 up to (including) 2.22.0
          *cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* versions from (including) 1.0.0 up to (including) 1.30.2
          *cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* versions from (including) 1.31.0 up to (including) 1.31.1
          *cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* versions from (including) 37.0.0 up to (including) 37.0.1
          *cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* versions from (including) r33 up to (including) r36
          *cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* versions from (including) 4.10.0 up to (including) 4.16.0
          *cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* versions from (including) 5.2.0 up to (including) 5.8.0
          *cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* versions from (including) 5.9.0 up to (including) 5.13.1

Added

Reference Type

F5 Networks: https://my.f5.com/manage/s/article/K000161585 Types: Vendor Advisory

New CVE Received from F5 Networks 6/17/2026 11:16:59 AM

Action	Type	New Value
Added	Description	NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When content is served or proxied through a location block with both source_charset utf-8; and a charset directive (for example, charset koi8-r;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their 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.
Added	CVSS V4.0	AV:N/AC:H/AT:N/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
Added	CVSS V3.1	AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Added	CWE	CWE-125
Added	Reference	https://my.f5.com/manage/s/article/K000161585
Added	Affected	[{"vendor":"F5","product":"NGINX Open Source","defaultStatus":"unknown","modules":["ngx_http_charset_module"],"versions":[{"version":"1.13.10","lessThan":"1.31.2","versionType":"custom","status":"affected"},{"version":"1.30.0","lessThan":"1.30.3","versionType":"custom","status":"affected"}]},{"vendor":"F5","product":"NGINX Plus","defaultStatus":"unaffected","modules":["ngx_http_charset_module"],"versions":[{"version":"37.0","lessThan":"37.0.2.1","versionType":"custom","status":"affected"},{"version":"R36","lessThan":"R36 P6","versionType":"custom","status":"affected"}]}]

Quick Info

CVE Dictionary Entry:
CVE-2026-48142
NVD Published Date:
06/17/2026
NVD Last Modified:
08/11/2026
Source:
F5 Networks

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Information Technology Laboratory

National Vulnerability Database