CVE-2026-42934
NGINX ngx_http_charset_module vulnerability
MEDIUM 6.3
At a glance
- Source
- NVD
- EPSS
- EPSS 0.73 % · percentile 54 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- f5
- NVD status
- Analyzed
Description
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.
Weaknesses (CWE)
- CWE-125 — Out-of-bounds Read
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L | f5 |
| CVSS 4.0 | MEDIUM 6.3 | 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 | f5 |
| CVSS 4.0 | MEDIUM 6.3 | 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 | NVD · f5sirt@f5.com (Secondary) |
| CVSS 3.1 | MEDIUM 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L | NVD · f5sirt@f5.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-30008
- GCVE · GCVE-0-2026-42934
CERT-FR advisories
- CERTFR-2026-AVI-1056 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0612 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0591 — Multiples vulnérabilités dans les produits F5 · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*≥ 4.3.0 ≤ 4.7.0cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:*cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*≥ 1.3.0 ≤ 1.6.2cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*≥ 2.0.0 ≤ 2.6.0cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*≥ 3.5.0 ≤ 3.7.2cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*≥ 4.0.0 ≤ 4.0.1cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*≥ 5.0.0 ≤ 5.4.2cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*≥ 2.16.0 ≤ 2.22.0cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*≥ 0.3.50 ≤ 0.9.7cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*≥ 1.0.0 ≤ 1.30.0cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*≥ r32 ≤ r36cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*≥ 4.9.0 ≤ 4.16.0cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*≥ 5.1.0 ≤ 5.8.0cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*≥ 5.9.0 ≤ 5.12.1
Affected products
| Product | Versions |
|---|---|
| F5 · NGINX Plus | unaffected R37 < * ; affected R36 < R36 P4 ; affected R32 < R32 P6 |
| F5 · NGINX Open Source | unaffected 1.31.0 < * ; affected 0.3.50 < 1.30.1 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |