# CVE-2026-41227: BIG-IP HTTP/2 Layer 7 Dos Protection vulnerability

> Attackers can cause a denial of service by triggering memory exhaustion in the TMM process on BIG-IP systems with Layer 7 DoS Protection enabled.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 May 2026
- **Updated:** 13 May 2026
- **Also known as:** GHSA-mggm-3mvj-fj65

## What is CVE-2026-41227?

CVE-2026-41227 is a high-severity denial of service vulnerability in F5 Big-Ip Advanced Web Application Firewall, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

On an HTTP/2 virtual server with Layer 7 DoS Protection configured, undisclosed traffic can result in an increase in memory consumption causing the Traffic Management Microkernel (TMM) process to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2026-41227?

It affects 3 products.


Products: F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Application Security Manager, F5 Big-Ip Ddos Hybrid Defender.

## How do I fix CVE-2026-41227?

No fix has been published for CVE-2026-41227 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-41227 being exploited?

There is no known exploitation of CVE-2026-41227 in the wild and no public exploit code.

## Other vulnerabilities in F5 Big-Ip Advanced Web Application Firewall

- [CVE-2021-23031](https://insights.sbomify.com/CVE-2021-23031/): Privilege escalation in BIG-IP Advanced WAF and BIG-IP ASM (critical 9.9)
- [CVE-2021-23029](https://insights.sbomify.com/CVE-2021-23029/): Server-side request forgery in BIG-IP Advanced WAF and BIG-IP ASM (high 8.8)
- [CVE-2021-23014](https://insights.sbomify.com/CVE-2021-23014/): Missing authorization in BIG-IP ASM/Advanced WAF (high 8.8)
- [CVE-2021-22993](https://insights.sbomify.com/CVE-2021-22993/): Cross-site scripting in BIG-IP Advanced WAF and BIG-IP ASM (high 8.8)
- [CVE-2026-40060](https://insights.sbomify.com/CVE-2026-40060/): BIG-IP Advanced WAF and ASM vulnerability (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41227 and fix it if it is affected.

What it is: CVE-2026-41227 is a high-severity denial of service vulnerability in F5 Big-Ip Advanced Web Application Firewall, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-41227 in the wild and no public exploit code.

Affected product: F5 Big-Ip Advanced Web Application Firewall. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-41227/ (Markdown: https://insights.sbomify.com/CVE-2026-41227/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41227
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41227
- OSV: https://osv.dev/vulnerability/CVE-2026-41227

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-41227/
Summaries are generated and may contain mistakes; the official description above is the record.