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CVE-2026-56434 is a use-after-free vulnerability in the NGINX ngx_http_ssi_module affecting NGINX Plus and NGINX Open Source. The flaw is exposed when Server-Side Includes (SSI) processing is enabled and used in combination with proxy_pass and proxy_buffering off. Under those conditions, an unauthenticated attacker who can act as a man-in-the-middle and control responses returned by an upstream server can trigger memory corruption in an NGINX worker process during SSI-related response handling. Public reporting also describes the issue as causing a memory-safety fault in the worker process, with observed outcomes including limited memory modification and worker process restart. The issue is confined to the data plane rather than the control plane.
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A use-after-free vulnerability in NGINX's ngx_http_ssi_module that can be triggered in specific SSI and proxy configurations by a man-in-the-middle attacker, causing limited memory modification or crashes.
A vulnerability in the ngx_http_ssi_module of NGINX Plus and NGINX Open Source that can allow an unauthenticated attacker with MITM capability over upstream responses to trigger a heap buffer over-read, potentially causing limited memory modification or restarting the NGINX worker process.
Уязвимость в nginx в модуле ngx_http_ssi_module, связанная с обработкой SSI и способная приводить к утечке памяти или отказу в обслуживании.
Уязвимость в nginx в модуле ngx_http_ssi_module, связанная с повреждением памяти и потенциально приводящая к отказу в обслуживании.
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Cross-references every affected SKU, including bundled OEM variants.
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