9.2

CVE-2026-42055

Medienbericht

NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
F5 ≫ Dos SwPlatformnginx Version >= 4.3.0 <= 4.7.0
F5 ≫ Dos Version4.9.0 SwPlatformnginx
F5 ≫ Nginx Gateway Fabric Version >= 1.3.0 <= 1.6.2
F5 ≫ Nginx Gateway Fabric Version >= 2.0.0 <= 2.6.3
F5 ≫ Nginx Ingress Controller SwEditioncontinuous_releases Version >= 3.5.0 <= 3.7.2
F5 ≫ Nginx Ingress Controller SwEditioncontinuous_releases Version >= 4.0.0 <= 4.0.1
F5 ≫ Nginx Ingress Controller SwEditioncontinuous_releases Version >= 5.0.0 <= 5.5.0
F5 ≫ Nginx Instance Manager Version >= 2.17.0 <= 2.22.0
F5 ≫ Nginx Open Source Version >= 1.0.0 <= 1.30.2
F5 ≫ Nginx Open Source Version >= 1.31.0 <= 1.31.1
F5 ≫ Nginx Plus SwEditionlong-term_support Version >= 37.0.0.1 < 37.0.2.1
F5 ≫ Nginx Plus SwEditioncontinuous_releases Version >= r33 < r36
F5 ≫ Nginx Plus Versionr36 Update- SwEditioncontinuous_releases
F5 ≫ Nginx Plus Versionr36 Updatep1 SwEditioncontinuous_releases
F5 ≫ Nginx Plus Versionr36 Updatep2 SwEditioncontinuous_releases
F5 ≫ Nginx Plus Versionr36 Updatep3 SwEditioncontinuous_releases
F5 ≫ Nginx Plus Versionr36 Updatep4 SwEditioncontinuous_releases
F5 ≫ Nginx Plus Versionr36 Updatep5 SwEditioncontinuous_releases
F5 ≫ Waf SwPlatformnginx Version >= 4.10.0 <= 4.16.0
F5 ≫ Waf SwPlatformnginx Version >= 5.2.0 <= 5.8.0
F5 ≫ Waf SwPlatformnginx Version >= 5.9.0 <= 5.13.1
Redhat ≫ Discovery Version-
Redhat ≫ Hardened Images Version-
Redhat ≫ Update Infrastructure Version >= 5.0 < 5.2
Redhat ≫ Enterprise Linux Version8.0
Redhat ≫ Enterprise Linux Version9.0
Redhat ≫ Enterprise Linux Version10.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 4.02% 0.896
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
F5 9.2 0 0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
F5 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-122 Heap-based Buffer Overflow

A 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-131 Incorrect Calculation of Buffer Size

The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

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22.06.2026 16:32
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18.06.2026 20:51
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https://bugzilla.redhat.com/show_bug.cgi?id=2489866
Third Party Advisory
Issue Tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42055.json
Third Party Advisory
https://my.f5.com/manage/s/article/K000161584
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:27197
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36331
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36364
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36618
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-42055
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36639
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:38847
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:44481
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:46836
Third Party Advisory