SEPTEMBER 9, 2026
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Case File

CVE-2026-56434

MEDIUM · CVSS 6.5 EPSS 0.45%

Source: NVD + CISA KEV + EPSS · Published 2026-07-15 · Last synced 2026-08-14

CyberRota Analysis

AI-Generated

NGINX Plus and NGINX Open Source are vulnerable due to a flaw in the ngx_http_ssi_module when configured with Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives. An unauthenticated attacker with man-in-the-middle capabilities could exploit this to trigger a use-after-free condition, potentially leading to limited memory modification or a restart of the NGINX worker process. Organizations using these NGINX configurations should prioritize patching to mitigate the risk of exploitation.

CVE
CVE-2026-56434
Severity
MEDIUM
CVSS
6.5
EPSS
0.45%
Nginx

Original NVD Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process. Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

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