CVE-2026-42530

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.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://my.f5.com/manage/s/article/K000161616	Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:20351
https://access.redhat.com/security/cve/CVE-2026-42530	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2489872	Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42530.json	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:f5:nginx_gateway_fabric::::::::
	cpe:2.3:a:f5:nginx_gateway_fabric::::::::
	cpe:2.3:a:f5:nginx_ingress_controller::::::::
	cpe:2.3:a:f5:nginx_ingress_controller::::::::
	cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:::::::*
	cpe:2.3:a:f5:nginx_ingress_controller:4.0.1:::::::*
	cpe:2.3:a:f5:nginx_instance_manager::::::::
	cpe:2.3:a:f5:nginx_open_source::::::::

History

No history.

Information

Published : 2026-06-17 15:16

Updated : 2026-07-16 12:17

NVD link : CVE-2026-42530

Mitre link : CVE-2026-42530

CVE.ORG link : CVE-2026-42530

JSON object : View

Products Affected

f5

nginx_instance_manager
nginx_open_source
nginx_ingress_controller
nginx_gateway_fabric

CWE

CWE-416

Use After Free

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