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High · 8.1 Public exploit CVE-2026-42530 EUVD-2026-37717GHSA-5mcp-3252-f5vr

NGINX Open-Source ngx_http_v3_module vulnerability

Published Jun 17, 2026 · Updated Jul 16, 2026 · Assigned by f5

Vendor: F5 Product: NGINX Open Source Package: nginx-mainline Category: Network devices Ecosystem: Wolfi

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 products

VendorProductAffectedFixed
F5 NGINX Open Source 1.31.0 – < 1.31.2 1.31.2

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
Red Hat Hardened Images 1 nginx +11 1.30.2-1.hum1 RHSA-2026:20351

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed nginx 1.31.2-1.1 openSUSE-SU-2026:11066-1

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling nginx-mainline 1.31.2-r0 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 3 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 3

References