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Vulnerability details

CVE-2026-97205

F5 NGINX Open SourceF5 NGINX Plus

NGINX ngx_http_core_module vulnerability

CVSS 4.0
9.2Critical

Official 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.

CVSS scores

ScoreVersionSourceVector
9.2Critical 4.0 CVEProject cvelistV5 (CNA) (f5) CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.1High 3.1 CVEProject cvelistV5 (CNA) (f5) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
F5 NGINX Open Source 1.30.0 ≤ v < 1.30.6 CVEProject cvelistV5 (CNA)
F5 NGINX Open Source 1.31.0 ≤ v < 1.31.7 CVEProject cvelistV5 (CNA)
F5 NGINX Plus 37.0.0 ≤ v < 37.0.5.1 CVEProject cvelistV5 (CNA)
F5 NGINX Plus 37.1.0 ≤ v < 37.1.0.1 CVEProject cvelistV5 (CNA)
F5 NGINX Plus R33 ≤ v CVEProject cvelistV5 (CNA)
F5 NGINX Plus R34 ≤ v CVEProject cvelistV5 (CNA)
F5 NGINX Plus R35 ≤ v CVEProject cvelistV5 (CNA)
F5 NGINX Plus R36 ≤ v CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-10-14
Last updated
2026-10-15
State
Published
Assigner (CNA)
f5
Kolun priority
38 · Medium

Exploit prediction (EPSS)

0.83%
Probability of exploitation in 30 days
57.8%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-416
    Use After Free