CVE-2026-97205

HIGH 8.1

NGINX ngx_http_core_module vulnerability

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_core_module module. When asynchronous file I/O (AIO) is enabled in certain configurations, processing a Server Side Includes (SSI) page containing “include virtual” commands may trigger a Use-After-Free (UAF) in the NGINX worker process. This may cause memory corruption or a worker process crash. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system, corrupt its memory, or possibly trigger code execution. 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.

CWE	CWE-416
Vendor	f5
Product	nginx plus
Published	Oct 14, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

F5 / NGINX Plus

37.1.0 < 37.1.0.1 37.0.0 < 37.0.5.1 R36 < * R35 < * R34 < * R33 < *

F5 / NGINX Open Source

1.31.0 < 1.31.7 1.30.0 < 1.30.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

my.f5.com: https://my.f5.com/manage/s/article/K000162608

Credits

🔍 F5 acknowledges Cyberlanc3r for bringing this issue to our attention and following the highest standards of coordinated disclosure.