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CVE-2026-42530— NGINX Open-Source ngx_http_v3_module vulnerability

Quick assessment

Affected
F5 NGINX Open Source
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

F5 nginx open source是美国F5公司开源的一款高性能Web服务器和反向代理。 F5 NGINX Open Source 1.31.0版本至1.31.2之前版本存在资源管理错误漏洞，该漏洞源于ngx_http_v3_module组件中的QPACK编码器流问题，可能导致远程未认证攻击者利用特制HTTP/3会话触发释放后重用，导致工作进程重启，或在ASLR禁用或绕过时执行代码。

CVSS 8.1 · High EPSS 1.15% · P66

Affected Version Matrix 1

VendorProduct Version RangeStatus
F5 NGINX Open Source 1.31.0< 1.31.2 affected
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I. Basic Information for CVE-2026-42530

Vulnerability Information
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Vulnerability Title
NGINX Open-Source ngx_http_v3_module vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
F5 NGINX Open Source 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 nginx open source是美国F5公司开源的一款高性能Web服务器和反向代理。 F5 NGINX Open Source 1.31.0版本至1.31.2之前版本存在资源管理错误漏洞，该漏洞源于ngx_http_v3_module组件中的QPACK编码器流问题，可能导致远程未认证攻击者利用特制HTTP/3会话触发释放后重用，导致工作进程重启，或在ASLR禁用或绕过时执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 NGINX Open Source 1.31.0 ~ 1.31.2 -

II. Public POCs for CVE-2026-42530

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III. Intelligence Information for CVE-2026-42530

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Vendor Advisories for CVE-2026-42530 (1)

Same Patch Batch · F5 · 2026-06-17 · 6 CVEs total

CVE-2026-42055 8.1 HIGH NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability
CVE-2026-11311 8.1 HIGH NGINX Gateway Fabric vulnerability
CVE-2026-50107 8.1 HIGH NGINX Gateway Fabric vulnerability
CVE-2026-32682 6.5 MEDIUM NGINX Gateway Fabric vulnerability
CVE-2026-48142 4.8 MEDIUM NGINX ngx_http_charset_module vulnerability

IV. Related Vulnerabilities

Same product: NGINX Open Source
Same vendor: F5
Same weakness: CWE-416

V. Comments for CVE-2026-42530

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