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Fencer Vulns
medium 4.8

CVE-2026-48142 json

NGINX ngx_http_charset_module vulnerability

published 2026-06-17 4 mo ago modified 2026-09-08 2 mo ago also BIT-nginx-2026-48142 , BIT-nginx-gateway-2026-48142 , BIT-nginx-gateway-fabric-2026-48142 , EUVD-2026-37719

cvss
4.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami nginx 1.30.3, 1.31.2
  • bitnami nginx-gateway 1.30.3, 1.31.2
  • bitnami nginx-gateway-fabric 2.6.4
  • F5 NGINX Open Source 1.30.3, 1.31.2
  • F5 NGINX Plus 37.0.2.1, R36 P6
  • nginx Debian 12 1.22.1-9+deb12u9
  • nginx Debian 13 1.26.3-3+deb13u7
  • nginx Debian 14 1.30.1-5

debian advisories DEBIAN-CVE-2026-48142

  • nginx Ubuntu 22.04 LTS 1.18.0-6ubuntu14.16
  • nginx Ubuntu 24.04 LTS 1.24.0-2ubuntu7.13
  • nginx Ubuntu 25.10 1.28.0-6ubuntu1.8
  • nginx Ubuntu 26.04 LTS 1.28.3-2ubuntu1.6

ubuntu advisories UBUNTU-CVE-2026-48142

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nginx hummingbird 1 1.30.3-2.hum1
  • nginx-core hummingbird 1 1.30.3-2.hum1
  • nginx-mod-mail hummingbird 1 1.30.3-2.hum1
  • nginx-filesystem hummingbird 1 1.30.3-2.hum1
  • nginx-mod-stream hummingbird 1 1.30.3-2.hum1
  • nginx-all-modules hummingbird 1 1.30.3-2.hum1
  • nginx-mod-http-perl hummingbird 1 1.30.3-2.hum1
  • nginx-mod-http-geoip hummingbird 1 1.30.3-2.hum1

red hat advisories RHSA-2026:27197

  • nginx SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.21.5-150400.3.25.1
  • nginx SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Server Applications 15 SP7 1.21.5-150600.10.24.1
  • nginx SLES 16.0, SLES for SAP applications 16.0 1.27.2-160000.6.1

suse advisories SUSE-SU-2026:3448-1SUSE-SU-2026:3329-1SUSE-SU-2026:22943-1SUSE-SU-2026:22951-1

  • nginx openSUSE Leap 16.0 1.27.2-160000.6.1
  • nginx openSUSE Tumbleweed 1.31.2-1.1

opensuse advisories openSUSE-SU-2026:21439-1openSUSE-SU-2026:11066-1

  • nginx Alpine 3.21 1.26.3-r2
  • nginx Alpine 3.23, Alpine 3.22 1.28.3-r4
  • nginx Alpine 3.24 1.30.3-r0

alpine advisories ALPINE-CVE-2026-48142

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nginx Azure Linux 3.0 1.28.3-6

azure linux advisories AZL-91176

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-48142 updated cvss 4.8

nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read

  • Red Hat Enterprise Linux 8 nginx, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, nginx-mod-http-perl, +2 more Red Hat Enterprise Linux 9 nginx, nginx-core, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, +3 more Red Hat Enterprise Linux 10 nginx
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images nginx 1.30.3-2.hum1, nginx-core 1.30.3-2.hum1, nginx-mod-mail 1.30.3-2.hum1, nginx-filesystem 1.30.3-2.hum1, nginx-mod-stream 1.30.3-2.hum1, nginx-all-modules 1.30.3-2.hum1, +5 more
    fixed: vendor fix RHSA-2026:27197

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
CNA 4.0 6.3 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
CNA 4.0 6.3 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/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

Affected packages

ecosystem package affected fixed in
bitnami nginx
>=1.0.0, <1.30.3
>=1.31.0, <1.31.2
1.30.3
1.31.2
bitnami nginx-gateway
>=1.0.0, <1.30.3
>=1.31.0, <1.31.2
1.30.3
1.31.2
bitnami nginx-gateway-fabric
>=1.3.0, <2.6.4
2.6.4

Affected products

  • F5 NGINX Open Source
  • F5 NGINX Plus

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.