CVE-2026-42055
CVE-2026-42055: 2 tracked advisory records across F5, Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
F5
1 advisory- Advisory severityCritical9.2
Critical [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
CVE-2026-42055Source published Source updated
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…
- Affected products in this advisory
- NGINX Open Source
- NGINX Plus
- Source-reported affected versions
- NGINX Open Source 1.13.10 before 1.31.2
- NGINX Open Source 1.30.2 before 1.30.3
- NGINX Plus 37.0 before 37.0.2.1
- NGINX Plus R36 before R36 P6
- Source-reported fixed versions
- 1.31.2
- 1.30.3
- 37.0.2.1
- R36 P6
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
Red Hat
1 advisory- Advisory severityHigh8.1
High [CVE-2026-42055] Arbitrary code execution or Denial of Service via heap-based buffer overflow with crafted HTTP/2 headers
CVE-2026-42055Source published Source updated
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…
- Affected products in this advisory
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Discovery 2
4 more entries in the full advisory.
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- nginx-2:1.26.3-6.el10_2.5
- nginx:1.24-8100020260707171317.489197e6
- nginx-2:1.20.1-28.el9_8.4
- nginx:1.24-9080020260707164406.9
17 more entries in the full advisory.
- Mitigation guidance
- To mitigate this vulnerability, ensure that the `ignore_invalid_headers` directive is set to `on` in your NGINX configuration, or reduce the size specified by the `large_client_header_buffers` directive to 2 megabytes or less. These changes require an NGINX service reload or restart to take effect. Reloading the NGINX service is generally safe, but a restart will briefly interrupt service.
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