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CVE-2026-56434: NGINX ngx_http_ssi_module vulnerability

mediumCVSS 6.5CVE-2026-56434

CSIRTS triage

vendor: NGINXproduct: NGINXOther
What
There is a vulnerability in the ngx_http_ssi_module.
Who is affected
Deployments of NGINX with the SSI module enabled.
Urgency
Medium urgency as it may lead to unexpected behavior in web applications.
Action
Update to the latest version of NGINX.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 6.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56434

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-56434coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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