NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_slice_module module. When the slice directive and unnamed regex captures are configured or when a background cache update happens, unauthenticated attackers can send requests that may cause uninitialized memory access in the NGINX worker process, leading to limited disclosure of memory or a restart. Impact: This vulnerability may allow remote, unauthenticated attackers to have limited control to disclose memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only. Note: The ngx_http_slice_module module is not enabled by default; it's enabled with the --with-http_slice_module configuration parameter. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.2, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts limited data confidentiality, and availability (service disruption) for affected systems. Impacting 6 products from f5, from f5, from f5 and 3 others, organizations running these solutions should prioritize assessment and patching.
Reported in 2026, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2026-07-15T16:16:49.820
2026-08-11T15:09:03.683
Analyzed
CVSSv3.1: 8.2 (HIGH)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | f5 | nginx_gateway_fabric | ≤ 1.6.2 | Yes |
| Application | f5 | nginx_gateway_fabric | < 2.6.7 | Yes |
| Application | f5 | nginx_ingress_controller | ≤ 3.7.2 | Yes |
| Application | f5 | nginx_ingress_controller | < 5.5.3 | Yes |
| Application | f5 | nginx_ingress_controller | < 2026-lts-r4 | Yes |
| Application | f5 | nginx_ingress_controller | 4.0.0 | Yes |
| Application | f5 | nginx_ingress_controller | 4.0.1 | Yes |
| Application | f5 | nginx_instance_manager | < 2.22.2 | Yes |
| Application | f5 | nginx_open_source | < 1.30.4 | Yes |
| Application | f5 | nginx_open_source | 1.31.2 | Yes |
| Application | f5 | nginx_plus | < 37.0.3.1 | Yes |
| Application | f5 | nginx_plus | < r36 | Yes |
| Application | f5 | nginx_plus | r36 | Yes |
| Application | f5 | nginx_plus | r36 | Yes |
| Application | f5 | nginx_plus | r36 | Yes |
| Application | f5 | nginx_plus | r36 | Yes |
| Application | f5 | nginx_plus | r36 | Yes |
| Application | f5 | nginx_plus | r36 | Yes |
| Application | f5 | nginx_plus | r36 | Yes |
| Application | f5 | waf | ≤ 4.16.0 | Yes |
| Application | f5 | waf | ≤ 5.8.0 | Yes |
| Application | f5 | waf | < 5.13.4 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For f5's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.