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CVE-2026-97205 – Use-After-Free (Memory Corruption / Worker Crash) – NGINX Open Source 1.30.0–1.30.5

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Summary

CVE-2026-97205 is a Use-After-Free vulnerability (CWE-416) in the ngx_http_core_module of NGINX, affecting NGINX Open Source and NGINX Plus. It is rated High severity (CVSS v3.1 8.1) and can cause memory corruption or a worker process crash. Code execution is possible when ASLR is disabled.

Technical details

  • Root cause: Use-After-Free in ngx_http_core_module.
  • Trigger conditions: Asynchronous file I/O (the aio directive) is enabled together with Server Side Includes (SSI) processing.
  • Attack vector: Network, unauthenticated, no user interaction. Attack complexity is rated High.
  • Impact: Memory corruption or worker process crash (denial of service). Potential code execution when ASLR is disabled.

Affected software

  • NGINX Open Source: 1.30.0 before 1.30.6
  • NGINX Open Source: 1.31.0 before 1.31.7
  • NGINX Plus: 37.1.0 before 37.1.0.1
  • NGINX Plus: 37.0.0 before 37.0.5.1
  • NGINX Plus: R36, R35, R34, R33 (listed as affected in the CVE record)

Severity

  • CVSS v3.1 base score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade NGINX Open Source to 1.30.6 or 1.31.7. Upgrade NGINX Plus to 37.1.0.1 or 37.0.5.1, as applicable. See the F5 advisory K000162608 for guidance on the other NGINX Plus releases.
  • If patching is not possible: Disable the aio directive or avoid serving SSI pages.
  • Check that ASLR is enabled on hosts running NGINX.

References

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