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6.5 Medium

CVE-2026-56434 NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module

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.

Affected products and versions

Product Affected versions Fixed in
NGINX Plus 37.0 37.0.0.1 → < 37.0.3.1 37.0.3.1
NGINX Open Source 1.31 1.31.2 → < 1.31.3 1.31.3
NGINX Open Source 0.8 0.8.11 → < 1.30.4 1.30.4

References

Timeline

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Other CVEs of NGINX Plus

The 37 CVEs of NGINX Plus →
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