CVE-2026-42055
EUVD-2026-3771817.06.2026, 15:16
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.Enginsight
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| f5 | dos | 4.9.0 |
| f5 | nginx_app_protect_dos | 4.3.0 ≤ 𝑥 ≤ 4.7.0 |
| f5 | nginx_app_protect_waf | 4.10.0 ≤ 𝑥 ≤ 4.16.0 |
| f5 | nginx_app_protect_waf | 5.2.0 ≤ 𝑥 ≤ 5.8.0 |
| f5 | nginx_gateway_fabric | 1.3.0 ≤ 𝑥 ≤ 1.6.2 |
| f5 | nginx_gateway_fabric | 2.0.0 ≤ 𝑥 < 2.6.4 |
| f5 | nginx_ingress_controller | 3.5.0 ≤ 𝑥 ≤ 3.7.2 |
| f5 | nginx_ingress_controller | 5.0.0 ≤ 𝑥 < 5.5.1 |
| f5 | nginx_ingress_controller | 4.0.0 |
| f5 | nginx_ingress_controller | 4.0.1 |
| f5 | nginx_instance_manager | 2.17.0 ≤ 𝑥 ≤ 2.22.0 |
| f5 | nginx_open_source | 1.30.0 ≤ 𝑥 < 1.30.3 |
| f5 | nginx_open_source | 1.31.1 |
| f5 | nginx_plus | 37.0.0 ≤ 𝑥 ≤ 37.0.1 |
| f5 | waf | 5.9.0 ≤ 𝑥 ≤ 5.13.1 |
| f5 | waf | 4.8.1 |
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | 2:1.26.3-6.el10_2.5 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 8 | 8100020260707171317.489197e6 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9 | 2:1.20.1-28.el9_8.4 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9 | 9080020260707164406.9 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9 | 9080020260707110000.9 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Discovery 2 | 1784821750 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Hardened Images | 1.30.3-2.hum1 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Update Infrastructure 5 | 1784794818 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Update Infrastructure 5 | 1784794778 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Update Infrastructure 5 | 1784795076 ≤ 𝑥 < * | ADP |
Debian Releases
Ubuntu Releases
openSUSE / SLES Releases
openSUSE Product | |||||||
|---|---|---|---|---|---|---|---|
| nginx |
| ||||||
| nginx-source |
|
Red Hat Enterprise Linux Releases
Red Hat Product | |||
|---|---|---|---|
| nginx |
| ||
| nginx-all-modules |
| ||
| nginx-core |
| ||
| nginx-filesystem |
| ||
| nginx-mod-devel |
| ||
| nginx-mod-http-image-filter |
| ||
| nginx-mod-http-perl |
| ||
| nginx-mod-http-xslt-filter |
| ||
| nginx-mod-mail |
| ||
| nginx-mod-stream |
|
Amazon Linux Releases
Amazon Package | |||
|---|---|---|---|
| nginx |
| ||
| nginx-all-modules |
| ||
| nginx-core |
| ||
| nginx-core-debuginfo |
| ||
| nginx-debuginfo |
| ||
| nginx-debugsource |
| ||
| nginx-filesystem |
| ||
| nginx-mod-devel |
| ||
| nginx-mod-http-image-filter |
| ||
| nginx-mod-http-image-filter-debuginfo |
| ||
| nginx-mod-http-perl |
| ||
| nginx-mod-http-perl-debuginfo |
| ||
| nginx-mod-http-xslt-filter |
| ||
| nginx-mod-http-xslt-filter-debuginfo |
| ||
| nginx-mod-mail |
| ||
| nginx-mod-mail-debuginfo |
| ||
| nginx-mod-stream |
| ||
| nginx-mod-stream-debuginfo |
|
Common Weakness Enumeration
- CWE-122 - Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
- CWE-787 - Out-of-bounds WriteThe software writes data past the end, or before the beginning, of the intended buffer.
- CWE-131 - Incorrect Calculation of Buffer SizeThe software does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
Vulnerability Media Exposure
References