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[UPDATE] [high] NGINX Open Source and NGINX Plus: Vulnerability allows denial of service and potentially code execution

highCVE-2026-9256
A remote, anonymous attacker can exploit a vulnerability in NGINX and NGINX Plus to conduct a denial of service attack and potentially execute arbitrary code.

CSIRTS triage

vendor: NGINXproduct: NGINX Open Source and NGINX PlusDenial of serviceOther
What
A remote, anonymous attacker can exploit a vulnerability in NGINX and NGINX Plus to conduct a denial of service attack and potentially execute arbitrary code.
Who is affected
Deployments of NGINX Open Source and NGINX Plus.
Urgency
Remediation is high urgency due to the potential for denial of service and code execution.
Action
Update to the latest version immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity
high
Published
2026-08-25
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1661

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-2026-9256coverage & exploitation statusNVD · CVE.org

Recent advisories for NGINX Open Source

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CERT-Bund (BSI) Security Advisories