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Vulnerability · Published Oct 14, 2026 · Assigned by f5

CVE-2026-97205NGINX ngx_http_core_module vulnerability

High 8.1

In plain English

A high-severity use-after-free in NGINX Open Source from F5. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.8%top 42.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24nginx1.30.6-r0ALPINE-CVE-2026-97205
Debian:12nginxno fix listedDEBIAN-CVE-2026-97205
Debian:13nginx1.26.3-3+deb13u10DEBIAN-CVE-2026-97205
Debian:14nginx1.30.4-8DEBIAN-CVE-2026-97205
Ubuntu:22.04:LTSnginx1.18.0-6ubuntu14.22UBUNTU-CVE-2026-97205
Ubuntu:22.04:LTSnginx1.18.0-6ubuntu14.22USN-8955-1
Ubuntu:24.04:LTSnginx1.24.0-2ubuntu7.19USN-8955-1
Ubuntu:24.04:LTSnginx1.24.0-2ubuntu7.19UBUNTU-CVE-2026-97205
Ubuntu:26.04:LTSnginx1.28.3-2ubuntu1.12USN-8955-1
Ubuntu:26.04:LTSnginx1.28.3-2ubuntu1.12UBUNTU-CVE-2026-97205
Ubuntu:26.10nginx1.30.4-7ubuntu1.1USN-8955-1
Ubuntu:26.10nginx1.30.4-7ubuntu1.1UBUNTU-CVE-2026-97205

Affected products (as reported)

VendorProductVersions
F5 NGINX Plus 37.1.0 – before 37.1.0.137.0.0 – before 37.0.5.1R36 – before *R35 – before *R34 – before *R33 – before *
F5 NGINX Open Source 1.31.0 – before 1.31.71.30.0 – before 1.30.6

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References