CVE-2026-42055— NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability
Possible ATT&CK Techniques 2AI
T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| F5 | NGINX Open Source | 1.13.10< 1.31.2 | affected |
1.30.2< 1.30.3 | affected | ||
| F5 | NGINX Plus | 37.0< 37.0.2.1 | affected |
R36< R36 P6 | affected |
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I. Basic Information for CVE-2026-42055
Vulnerability Information
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Vulnerability Title
NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set to off, and the large_client_header_buffers directive size is larger than 2 megabytes. A remote, unauthenticated attacker, along with conditions beyond their control, could send large headers while creating an upstream request. This may cause a heap-based buffer overflow 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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
F5 NGINX Open Source 缓冲区错误漏洞
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 1.13.10版本至1.31.2之前版本、1.30.2版本至1.30.3之前版本存在缓冲区错误漏洞，该漏洞源于ngx_http_proxy_v2_module和ngx_http_grpc_module模块的堆缓冲区溢出，可能导致远程未验证攻击者绕过ASLR发送大标头，造成工作进程重启或执行任意代码。
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 | 1.13.10 ~ 1.31.2 | - | |
| F5 | NGINX Plus | 37.0 ~ 37.0.2.1 | - |
II. Public POCs for CVE-2026-42055
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
default-local-qwen3.6 · 12814 chars
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III. Intelligence Information for CVE-2026-42055
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Other References for CVE-2026-42055 (1)
- https://my.f5.com/manage/s/article/K000161584vendor-advisory
Same Patch Batch · F5 · 2026-06-17 · 6 CVEs total
| CVE-2026-42530 | 8.1 HIGH | NGINX Open-Source ngx_http_v3_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
V. Comments for CVE-2026-42055
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