CVE-2026-42530

Published: Jun 17, 2026Modified: Jul 2, 2026

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XShow less

Source: f5sirt@f5.com (Secondary)

Description

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.

Affected (8)

Products: F5: Nginx Gateway Fabric, Nginx Ingress Controller, Nginx Instance Manager, Nginx Open Source

4 products

Nginx Gateway Fabric

Nginx Ingress Controller

Nginx Instance Manager

Nginx Open Source

Configuration A

8 vulnerable

Vulnerable Software	Affected Versions
F5 Nginx Gateway Fabric	From 1.3.0 to 1.6.2
F5 Nginx Gateway Fabric	From 2.0.0 to 2.6.4
F5 Nginx Ingress Controller	From 3.5.0 to 3.7.2
F5 Nginx Ingress Controller	From 5.0.0 to 5.5.1
F5 Nginx Ingress Controller	Version 4.0.0
F5 Nginx Ingress Controller	Version 4.0.1
F5 Nginx Instance Manager	From 2.17.0 to 2.22.0
F5 Nginx Open Source	From 1.31.0 to 1.31.2