NetSight
IP …
high8.1

CVE-2026-42055

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules.

Impact

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.

Affected products

VendorProductAffected versions
F5Dos
from 4.3.0 through 4.7.0
Version 4.9.0
F5Nginx Gateway Fabric
from 1.3.0 through 1.6.2
from 2.0.0 through 2.6.3
F5Nginx Ingress Controller
from 3.5.0 through 3.7.2
from 4.0.0 through 4.0.1
from 5.0.0 through 5.5.0
F5Nginx Instance Manager
from 2.17.0 through 2.22.0
F5Nginx Open Source
from 1.0.0 through 1.30.2
from 1.31.0 through 1.31.1
F5Nginx Plus
from 37.0.0.1 before 37.0.2.1
from r33 before r36
Version r36
F5Waf
from 4.10.0 through 4.16.0
from 5.2.0 through 5.8.0
from 5.9.0 through 5.13.1
RedhatDiscovery
All versions
RedhatHardened Images
All versions
RedhatUpdate Infrastructure
from 5.0 before 5.2
RedhatEnterprise Linux
Versions 8.0, 9.0, 10.0

Weakness classification

CWE-122CWE-787CWE-131

References