CVE-2026-42530

critical · 9.2

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.

9.2

CVSS

3.8%

EPSS (exploit prob.)

90th

EPSS percentile

2026-06-17

Published

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

Weaknesses

CWE-416

Affected products

Vendor	Product	Affected versions
f5	nginx_gateway_fabric	>= 1.3.0, <= 1.6.2
f5	nginx_gateway_fabric	>= 2.0.0, < 2.6.4
f5	nginx_ingress_controller	>= 3.5.0, <= 3.7.2
f5	nginx_ingress_controller	>= 5.0.0, < 5.5.1
f5	nginx_ingress_controller	4.0.0
f5	nginx_ingress_controller	4.0.1
f5	nginx_instance_manager	>= 2.17.0, <= 2.22.0
f5	nginx_open_source	>= 1.31.0, < 1.31.2

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-42530