# Nine Nines Cowboy vulnerabilities

Source: https://junglewise.ai/threats/technologies/cowboy  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/cowboy.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in Nine Nines Cowboy: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-65624, was published on 28 July 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 3 (0 critical, 0 exploited in the wild)

## About Nine Nines Cowboy

Cowboy is a small, fast, and modular HTTP server written in Erlang for building web applications.

## Latest Nine Nines Cowboy vulnerabilities

- [CVE-2026-65624: ninenines cowboy memory exhaustion via duplicate HTTP headers](https://junglewise.ai/threats/cve-2026-65624-ninenines-cowboy-memory-exhaustion-via-duplicate-http-headers) (info, CVSS 6.9, published 28 Jul 2026)
- [CVE-2026-43966: ninenines cowlib HTTP response splitting in structured headers](https://junglewise.ai/threats/cve-2026-43966-ninenines-cowlib-http-response-splitting-in-structured-headers) (medium, CVSS 6.3, published 8 Jun 2026)
- [CVE-2026-8466: ninenines cowboy denial of service in multipart header parsing](https://junglewise.ai/threats/cve-2026-8466-ninenines-cowboy-denial-of-service-in-multipart-header-parsing) (high, CVSS 8.2, published 13 May 2026)

## Most severe Nine Nines Cowboy vulnerabilities

- [CVE-2026-8466: ninenines cowboy denial of service in multipart header parsing](https://junglewise.ai/threats/cve-2026-8466-ninenines-cowboy-denial-of-service-in-multipart-header-parsing) (high, CVSS 8.2, published 13 May 2026)
- [CVE-2026-43966: ninenines cowlib HTTP response splitting in structured headers](https://junglewise.ai/threats/cve-2026-43966-ninenines-cowlib-http-response-splitting-in-structured-headers) (medium, CVSS 6.3, published 8 Jun 2026)
- [CVE-2026-65624: ninenines cowboy memory exhaustion via duplicate HTTP headers](https://junglewise.ai/threats/cve-2026-65624-ninenines-cowboy-memory-exhaustion-via-duplicate-http-headers) (info, CVSS 6.9, published 28 Jul 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Nine Nines technologies

- [Nine Nines Cowlib](https://junglewise.ai/threats/technologies/cowlib): 6 vulnerabilities
- [Nine Nines Gun](https://junglewise.ai/threats/technologies/gun): 5 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Nine Nines Cowboy vulnerabilities", https://junglewise.ai/threats/technologies/cowboy, 11 November 2026.