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Vulnerabilities CVE-2026-56434

CVE-2026-56434

Medium
Open
TLP:CLEAR

NGINX ngx_http_ssi_module vulnerability

NVD CVE.org
Critical Infrastructure

AI Analysis

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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.

Details

CVSS Score
6.5
EPSS Score
0.45%

37.2th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Confidence
90%
Published
Jul 15, 2026
Last Modified
Jul 15, 2026
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