CVE-2026-42934
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Vulnerability report for CVE-2026-42934, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-05-13
Last updated on: 2026-06-18
Assigner: F5 Networks
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| f5 | nginx_ingress_controller | From 4.0.0 (inc) to 4.0.1 (inc) |
| f5 | nginx_gateway_fabric | From 1.3.0 (inc) to 1.6.2 (inc) |
| f5 | nginx_gateway_fabric | From 2.0.0 (inc) to 2.6.0 (inc) |
| f5 | nginx_ingress_controller | From 3.5.0 (inc) to 3.7.2 (inc) |
| f5 | nginx_ingress_controller | From 5.0.0 (inc) to 5.4.2 (inc) |
| f5 | nginx_instance_manager | From 2.16.0 (inc) to 2.22.0 (inc) |
| f5 | nginx_open_source | From 1.0.0 (inc) to 1.30.0 (inc) |
| f5 | nginx_plus | From r32 (inc) to r36 (inc) |
| f5 | dos | 4.8.0 |
| f5 | waf | From 5.9.0 (inc) to 5.12.1 (inc) |
| f5 | nginx_open_source | From 0.3.50 (inc) to 0.9.7 (inc) |
| f5 | dos | From 4.3.0 (inc) to 4.7.0 (inc) |
| f5 | waf | From 5.1.0 (inc) to 5.8.0 (inc) |
| f5 | waf | From 4.9.0 (inc) to 4.16.0 (inc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-125 | The product reads data past the end, or before the beginning, of the intended buffer. |
