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8.1 High

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

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.

Affected products and versions

Product Affected versions Fixed in
NGINX Open Source 1.30 1.30.2 → < 1.30.3 1.30.3
NGINX Open Source 1.13 1.13.10 → < 1.31.2 1.31.2
NGINX Plus 37.0 37.0 → < 37.0.2.1 37.0.2.1
Red Hat Hardened Images 1.30 earliest → < 1.30.3-2.hum1 1.30.3-2.hum1
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 8 8100020260707171317.489197 earliest → < 8100020260707171317.489197e6 8100020260707171317.489197e6
Red Hat Enterprise Linux 9 9080020260707110000.9 earliest → < 9080020260707110000.9 9080020260707110000.9
Red Hat Enterprise Linux AppStream (v. 10) Versions not published
Red Hat Enterprise Linux AppStream (v. 9) Versions not published
Show the 6 other branches
Product Affected versions Fixed in
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) Versions not published
Red Hat Openshift Data Foundation 4 Versions not published
Red Hat Enterprise Linux AppStream (v. 8) Versions not published
Red Hat Update Infrastructure 5 1787241260 earliest → < 1787241260 1787241260
Red Hat Discovery 2 1784821750 earliest → < 1784821750 1784821750

References

Timeline

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