Riskcovery

CVE-2026-97205

NGINX ngx_http_core_module vulnerability

State
Published
Severity
9.2 Critical
Published
Oct 14, 2026
Updated
Oct 15, 2026
Reserved
Sep 30, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
4.09.2 CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:Nf5
3.18.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hf5

Weaknesses

Affected Products

ProductVersions
NGINX PlusF5
  • 37.1.0 to before 37.1.0.1Affected
  • 37.0.0 to before 37.0.5.1Affected
  • R36 and laterAffected
  • R35 and laterAffected
  • R34 and laterAffected
  • R33 and laterAffected
NGINX Open SourceF5
  • 1.31.0 to before 1.31.7Affected
  • 1.30.0 to before 1.30.6Affected

References

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