# [HIGH] F5 Patches NGINX Vulnerability That Enables Code Execution and DoS Attacks

**Source:** Cyber Security News
**Published:** 2026-06-18
**Article:** https://cybersecuritynews.com/nginx-vulnerability-patched/

## Threat Profile

F5 has released an out-of-band security advisory addressing multiple high-severity vulnerabilities in NGINX that could allow attackers to execute arbitrary code and launch denial-of-service (DoS) attacks across affected environments. The advisory, published on June 17, 2026, highlights several critical flaws impacting NGINX Open Source, NGINX Plus, and related products, including NGINX Gateway Fabric and NGINX […] The post F5 Patches NGINX Vulnerability That Enables Code Execution and DoS …

## Indicators of Compromise (high-fidelity only)

- **CVE:** `CVE-2026-42530`
- **CVE:** `CVE-2026-42055`
- **CVE:** `CVE-2026-11311`
- **CVE:** `CVE-2026-50107`
- **CVE:** `CVE-2026-48142`

## MITRE ATT&CK Techniques

- **T1190** — Exploit Public-Facing Application

## Kill chain phases observed

_(none detected from narrative keywords)_

## Recommended hunts

### IOC-driven hunts (use shared templates)

These are standard IOC-substitution hunts — the canonical SPL and KQL live once in [`_TEMPLATES.md`](../_TEMPLATES.md), so we don't repeat the same boilerplate on every CVE / hash / network-IOC briefing.

- **Asset exposure — vulnerability matches article CVE(s)** ([template](../_TEMPLATES.md#asset-exposure)) — phase: **recon**, confidence: **High**
  - CVE(s): `CVE-2026-42530`, `CVE-2026-42055`, `CVE-2026-11311`, `CVE-2026-50107`, `CVE-2026-48142`


## Why this matters

Severity classified as **HIGH** based on: CVE present, 1 use case(s) fired, 1 technique(s) inferred. Read the full article for actor attribution, tooling details, and any defanged IOCs in the body that aren't visible in the RSS summary.