CVE-2026-48142
published 2026-06-17CVE-2026-48142: 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…
PriorityP429medium4.8CVSS 3.1
AVNACHPRNUINSUCLINAL
EPSS
0.37%
30.0th percentile
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.
Affected
30 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| f5 | dos | — | — |
| f5 | dos | 4.3.0 – 4.7.0 | — |
| f5 | nginx_gateway_fabric | — | — |
| f5 | nginx_gateway_fabric | 1.3.0 – 1.6.2 | — |
| f5 | nginx_gateway_fabric | 2.0.0 – 2.6.3 | — |
| f5 | nginx_ingress_controller | 3.5.0 – 3.7.2 | — |
| f5 | nginx_ingress_controller | 4.0.0 – 4.0.1 | — |
| f5 | nginx_ingress_controller | 5.0.0 – 5.5.0 | — |
| f5 | nginx_instance_manager | 2.17.0 – 2.22.0 | — |
| f5 | nginx_open_source | 1.0.0 – 1.30.2 | — |
| f5 | nginx_open_source | >= 1.13.10 < 1.31.2 | 1.31.2 |
| f5 | nginx_open_source | >= 1.30.0 < 1.30.3 | 1.30.3 |
| f5 | nginx_open_source | 1.31.0 – 1.31.1 | — |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | — | — |
| f5 | nginx_plus | >= 37.0 < 37.0.2.1 | 37.0.2.1 |
| f5 | nginx_plus | >= 37.0.0.1 < 37.0.2.1 | 37.0.2.1 |
| f5 | nginx_plus | >= R36 < R36 P6 | R36 P6 |
| f5 | nginx_plus | >= r33 < r36 | r36 |
| f5 | waf | 4.10.0 – 4.16.0 | — |
CVSS provenance
nvdv3.14.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
nvdv4.06.3MEDIUMCVSS:4.0/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
cvelistv5v3.14.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
vendor_redhat4.8MEDIUM
vendor_ubuntu4.8MEDIUM
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Ubuntu
nginx vulnerabilities
vendor_ubuntu·2026-06-22·CVSS 4.8
CVE-2026-48142 [MEDIUM] nginx vulnerabilities
Title: nginx vulnerabilities
Summary: Several security issues were fixed in nginx.
It was discovered that nginx incorrectly handled large headers when
proxying HTTP/2 traffic. A remote attacker could use this issue to cause
nginx to crash, resulting in a denial of service, or possibly execute
arbitrary code. The default compiler options for affected releases should
reduce the vulnerability to a denial of service. (CVE-2026-42055)
It was discovered that nginx incorrectly handled character set conversion
under certain circumstances. A remote attacker could possibly use this
issue to obtain sensitive information or cause nginx to crash, resulting in
a denial of service. (CVE-2026-48142)
Instructions: In general, a standard system update will make all the necessary changes.
F5
CVE-2026-48142: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module
vendor_f5·2026-06-17·CVSS 4.8
CVE-2026-48142 [MEDIUM] CWE-125 CVE-2026-48142: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module
CVE-2026-48142: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module
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.
Affected Products: NGINX Plus
F5 Advisory Articles: K000161585
F5 References: https://my.f5.com/manage/s/article/K0001615
Red Hat
nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read
vendor_redhat·2026-06-17·CVSS 4.8
CVE-2026-48142 [MEDIUM] CWE-125 nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read
nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read
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.
A flaw was found in NGINX. Remote, unauthenticated attackers can exploit a vulnerability in the `ngx_http_charset_module` when s
VulDB
F5 NGINX Open Source/NGINX Plus up to 1.30.2/1.31.1 out-of-bounds (K000161585)
vuldb·2026-06-17
CVE-2026-48142 [CRITICAL] F5 NGINX Open Source/NGINX Plus up to 1.30.2/1.31.1 out-of-bounds (K000161585)
A vulnerability identified as critical has been detected in F5 NGINX Open Source and NGINX Plus up to 1.30.2/1.31.1. This affects an unknown function. The manipulation leads to out-of-bounds read.
This vulnerability is uniquely identified as CVE-2026-48142. The attack is possible to be carried out remotely. No exploit exists.
You should upgrade the affected component.
CVEList
NGINX ngx_http_charset_module vulnerability
cvelistv5·2026-06-17·CVSS 4.8
CVE-2026-48142 [MEDIUM] CWE-125 NGINX ngx_http_charset_module vulnerability
NGINX ngx_http_charset_module vulnerability
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.
GHSA
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module.
ghsa_unreviewed·2026-06-17
CVE-2026-48142 [MEDIUM] CWE-125 NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module.
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-48142 nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read [fedora-all]
bugzilla·2026-06-23·CVSS 4.8
CVE-2026-48142 [MEDIUM] CVE-2026-48142 nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read [fedora-all]
CVE-2026-48142 nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-48142 nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read
bugzilla·2026-06-17·CVSS 4.8
CVE-2026-48142 [MEDIUM] CVE-2026-48142 nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read
CVE-2026-48142 nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read
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.
2026-06-17
Published