Detections
Analytics
nginx 1.31.x < 1.31.2 Use-After-Free Vulnerability
critical Nessus Plugin ID 321538
Synopsis
The remote web server is affected by a use-after-free vulnerability.Description
The installed version of nginx is 1.31.x prior to 1.31.2. It is, therefore, affected by the following vulnerability:- NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. (CVE-2026-42530)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Upgrade to nginx 1.31.2 or later.See Also
Plugin Details
Severity: Critical
ID: 321538
File Name: nginx-CVE-2026-42530.nasl
Version: 1.1
Type: Combined
Agent: unix
Family: Web Servers
Published: 6/19/2026
Updated: 6/19/2026
Configuration: Enable paranoid mode
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: High
Base Score: 7.6
Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-42530
CVSS v3
Risk Factor: High
Base Score: 8.1
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4
Risk Factor: Critical
Base Score: 9.2
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
Vulnerability Information
CPE: cpe:/a:nginx:nginx
Required KB Items: Settings/ParanoidReport, installed_sw/nginx
Patch Publication Date: 6/17/2026
Vulnerability Publication Date: 6/17/2026
Reference Information
CVE: CVE-2026-42530
IAVA: 2026-A-0601