CVE-2026-42530

Published: Jun 17, 2026Modified: Jul 16, 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	1.3.0 ≤ version ≤ 1.6.2
F5 Nginx Gateway Fabric	2.0.0 ≤ version < 2.6.4
F5 Nginx Ingress Controller	3.5.0 ≤ version ≤ 3.7.2
F5 Nginx Ingress Controller	5.0.0 ≤ version < 5.5.1
F5 Nginx Ingress Controller	Version 4.0.0
F5 Nginx Ingress Controller	Version 4.0.1
F5 Nginx Instance Manager	2.17.0 ≤ version ≤ 2.22.0
F5 Nginx Open Source	1.31.0 ≤ version < 1.31.2