Read the docs
TI-2026-35579 Aliases CVE-2026-48142GHSA-2388-jp8v-fg9w

NGINX ngx_http_charset_module vulnerability

Priority LOW 29CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · None · Low
Fix status
Partial Red Hat: 1 fixed, 3 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00684 52nd percentileScored 2026-11-07
Fix Partial NGINX Open Source (F5): 1.31.2, 1.30.3NGINX Plus (F5): 37.0.2.1, R36 P6Red Hat: 1 advisoryRed Hat: 1 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
F5NGINX Open Source1.13.10 to before 1.31.2; 1.30.0 to before 1.30.31.31.2, 1.30.3Patch availableCNA
F5NGINX Plus37.0 to before 37.0.2.1; R36 to before R36 P637.0.2.1, R36 P6Patch availableCNA
  • NGINX Open Source VendorF5 Affected 1.13.10 to before 1.31.2; 1.30.0 to before 1.30.3 Fixed in 1.31.2, 1.30.3 Patch available CNA
  • NGINX Plus VendorF5 Affected 37.0 to before 37.0.2.1; R36 to before R36 P6 Fixed in 37.0.2.1, R36 P6 Patch available CNA

CPE configurations NVD · 15

CPEVersionsRoleVendor
cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*4.3.0 – 4.7.0VulnerableF5
cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*4.9.0VulnerableF5
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*1.3.0 – 1.6.2; 2.0.0 – 2.6.3VulnerableF5
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*3.5.0 – 3.7.2; 4.0.0 – 4.0.1; 5.0.0 – 5.5.0VulnerableF5
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*2.17.0 – 2.22.0VulnerableF5
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*1.0.0 – 1.30.2; 1.31.0 – 1.31.1VulnerableF5
cpe:2.3:a:f5:nginx_plus:*:*:*:*:long-term_support:*:*:*37.0.0.1 to before 37.0.2.1VulnerableF5
cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:*r33 to before r36VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:-:*:*:continuous_releases:*:*:*r36VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:continuous_releases:*:*:*r36 p1VulnerableF5
  • cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:* Versions 4.3.0 – 4.7.0 Vulnerable ·F5
  • cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:* Versions 4.9.0 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* Versions 1.3.0 – 1.6.2; 2.0.0 – 2.6.3 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:* Versions 3.5.0 – 3.7.2; 4.0.0 – 4.0.1; 5.0.0 – 5.5.0 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* Versions 2.17.0 – 2.22.0 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* Versions 1.0.0 – 1.30.2; 1.31.0 – 1.31.1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:*:*:*:*:long-term_support:*:*:* Versions 37.0.0.1 to before 37.0.2.1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:* Versions r33 to before r36 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:-:*:*:continuous_releases:*:*:* Versions r36 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:continuous_releases:*:*:* Versions r36 p1 Vulnerable ·F5
Show 5 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:continuous_releases:*:*:*r36 p2VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:continuous_releases:*:*:*r36 p3VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:continuous_releases:*:*:*r36 p4VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:p5:*:*:continuous_releases:*:*:*r36 p5VulnerableF5
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*4.10.0 – 4.16.0; 5.2.0 – 5.8.0; 5.9.0 – 5.13.1VulnerableF5
  • cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:continuous_releases:*:*:* Versions r36 p2 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:continuous_releases:*:*:* Versions r36 p3 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:continuous_releases:*:*:* Versions r36 p4 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:p5:*:*:continuous_releases:*:*:* Versions r36 p5 Vulnerable ·F5
  • cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* Versions 4.10.0 – 4.16.0; 5.2.0 – 5.8.0; 5.9.0 – 5.13.1 Vulnerable ·F5

Remediation

  • Fix · CNA NGINX Open Source (F5) Fixed in 1.31.2, 1.30.3
  • Fix · CNA NGINX Plus (F5) Fixed in 37.0.2.1, R36 P6

Red Hat 1 advisory

  • RHSA-2026:27197 Released 2026-06-19 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nginx-1.30.3-2.hum1@aarch64, nginx-1.30.3-2.hum1@src, nginx-1.30.3-2.hum1@x86_64 +22

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    F5 NGINX Open Source, NGINX Plus 1.30.3, 1.31.2 and 2 more versions

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-30432 NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerabilityPriority MEDIUM 51
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesFixed RHSA-2026:27197

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48142
  2. 2026-10-03 Alias added: GHSA-2388-jp8v-fg9w
  3. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Advisory 1

  • TI-2026-31136 NGINX ngx_http_rewrite_module vulnerability CVSS 4.0CRITICAL 9.2
  • TI-2026-08132 NGINX ngx_http_rewrite_module vulnerability CVSS 4.0CRITICAL 9.2
  • TI-2026-30432 NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability CVSS 4.0CRITICAL 9.2
  • TI-2026-31137 NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability CVSS 4.0HIGH 8.3
  • TI-2026-29212 NGINX ngx_quic_module vulnerability CVSS 4.0MEDIUM 6.9
  • TI-2026-31131 NGINX ngx_http_charset_module vulnerability CVSS 4.0MEDIUM 6.3
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences