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CVE-2026-42530

9.2 critical exploit ×4 SSVC exploitation: none Modified
NVD · CVE.org

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.

Fix

Public exploits 4

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 9.2 · f5NVD modified 2026-10-26 12:10

Affected (CPE criteria) 6

  • cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
  • 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:*:*:*:*:*:*:*:*

References 5