CVE-2026-42530High· 8.1▾ MidnightPoC availableNGINX 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 …
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 44.6 · likelihood 1.3 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Aug 1.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
3.7%
3 GitHub repos
3.7% → 6.5%
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.
nginx_gateway_fabric >= 1.3.0, <= 1.6.2nginx_gateway_fabric >= 2.0.0, < 2.6.4nginx_ingress_controller >= 3.5.0, <= 3.7.2nginx_ingress_controller >= 5.0.0, < 5.5.1nginx_ingress_controller = 4.0.0nginx_ingress_controller = 4.0.1nginx_instance_manager >= 2.17.0, <= 2.22.0nginx_open_source >= 1.31.0, < 1.31.2Upgrade past the affected range:
nginx_gateway_fabric 2.6.4nginx_ingress_controller 5.5.1nginx_open_source 1.31.2Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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