---
id: "CVE-2026-94127"
kind: "vulnerability"
aliases: ["CVE-2026-94127"]
title: "f5 big-ip access policy manager: When a BIG-IP APM access policy and an OAuth profile are configured on a virtual server, specific malicious traffic\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "F5 BIG-IP APM", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "f5 big-ip access policy manager", "fixed": [], "affected": ">= 17.0.0, <= 17.1.3", "ecosystem": "vendor"}, {"name": "f5 big-ip access policy manager", "fixed": [], "affected": ">= 17.5.0, <= 17.5.1", "ecosystem": "vendor"}, {"name": "f5 big-ip access policy manager", "fixed": [], "affected": "= 21.1.0", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["apm", "big-ip", "cloudflare", "exploited", "f5", "infrastructure", "lab-disclosure", "self-hosted"]
not_affected_if: ["default-config", "no-oauth-profile"]
published_at: "2026-09-22T00:00:00+00:00"
first_seen_at: "2026-10-23T19:11:50+00:00"
updated_at: "2026-10-24T17:31:20+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-94127", "first_seen_at": "2026-10-23T19:11:50+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-94127", "first_seen_at": "2026-10-23T23:44:52+00:00"}, {"source": "lab", "url": "https://developers.cloudflare.com/changelog/post/2026-10-06-waf-release/", "first_seen_at": "2026-10-24T17:18:15+00:00"}]
---

# f5 big-ip access policy manager: When a BIG-IP APM access policy and an OAuth profile are configured on a virtual server, specific malicious traffic…

F5 BIG-IP APM has a heap-based buffer overflow that occurs when an access policy and an OAuth profile are configured on a virtual server. An unauthenticated remote attacker can exploit it to run code on the device, and CISA lists it as known exploited.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:F5 BIG-IP APM affected ? fixed ?
- vendor:f5 big-ip access policy manager affected >= 17.0.0, <= 17.1.3 fixed ?
- vendor:f5 big-ip access policy manager affected >= 17.5.0, <= 17.5.1 fixed ?
- vendor:f5 big-ip access policy manager affected = 21.1.0 fixed ?

## How to check

Check whether any BIG-IP virtual server has both an APM access policy and an OAuth profile attached; the sources do not give a specific command.

## Fix

Apply the F5 vendor mitigation or patch for CVE-2026-94127; the sources do not name the fixed version. Follow CISA BOD 26-04 guidance and discontinue use of the affected configuration if no mitigation is available.

## Mitigated for you by

- Cloudflare (waf-rule, since 2026-10-06): covers HTTP requests proxied through Cloudflare that match the F5 BIG-IP unauthenticated heap-overflow exploit (Cloudflare Managed Ruleset rule ...7206c737) Limits: none stated Still: none stated https://developers.cloudflare.com/changelog/post/2026-10-06-waf-release/

## Timeline

- 2026-10-23T19:11:50+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-94127
- 2026-10-23T23:44:52+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-94127
- 2026-10-24T17:18:15+00:00 lab https://developers.cloudflare.com/changelog/post/2026-10-06-waf-release/ — Cloudflare: WAF Release - 2026-10-06 · Changelog

## Documents

- [advisory] Cloudflare: WAF Release - 2026-10-06 · Changelog https://developers.cloudflare.com/changelog/post/2026-10-06-waf-release/

## From the sources

WAF Release - 2026-10-06 · Changelog

# Changelog

New updates and improvements at Cloudflare.

October 6, 2026

## WAF Release - 2026-10-06

This release introduces a new detection to mitigate a heap-based buffer overflow vulnerability in F5 BIG-IP, and enhances existing command injection protections by incorporating tested beta logic into the baseline rule.

Key Findings

- CVE-2026-94127: A heap-based buffer overflow vulnerability in F5 BIG-IP. Attackers can exploit this flaw to execute arbitrary code on the affected system.

| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
| --- | --- | --- | --- | --- | --- | --- |
| Cloudflare Managed Ruleset | ...a056caff | N/A | Command Injection - Generic 8 - uri - Beta | Log | Block | This rule is merged into the original rule "Command Injection - Generic 8 - uri" (ID: ...ee159e2e). |
| Cloudflare Managed Ruleset | ...7206c737 | N/A | F5 BIG-IP - UnAuth Heap-Overflow - CVE:CVE-2026-94127 | Log | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...549f7356 | N/A | Next.js - Cache Poisoning - CVE:CVE-2026-94543 | Block | Block | Rule metadata description refined. Detection unchanged. |

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_