CVE-2026-97205 PUBLISHED

NGINX ngx_http_core_module vulnerability

Assigner: f5
Reserved: 30.09.2026 Published: 14.10.2026 Updated: 15.10.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 9.2

Product Status

Vendor F5
Product NGINX Plus
Versions Default: unknown
  • affected from 37.1.0 to 37.1.0.1 (excl.)
  • affected from 37.0.0 to 37.0.5.1 (excl.)
  • affected from R36 to * (excl.)
  • affected from R35 to * (excl.)
  • affected from R34 to * (excl.)
  • affected from R33 to * (excl.)
Vendor F5
Product NGINX Open Source
Versions Default: unaffected
  • affected from 1.31.0 to 1.31.7 (excl.)
  • affected from 1.30.0 to 1.30.6 (excl.)

Workarounds

Disable the "aio" directive or do not serve SSI pages.

Credits

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

References

Problem Types

  • CWE-416 Use After Free CWE

Impacts

  • CAPEC-234 Hijacking a privileged process