# Nine Nines Gun vulnerabilities

Source: https://junglewise.ai/threats/technologies/gun  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/gun.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 5 vulnerabilities in Nine Nines Gun: 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-2026-43966, was published on 8 June 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 5 (0 critical, 0 exploited in the wild)

## About Nine Nines Gun

Gun is an HTTP/1.1, HTTP/2 and Websocket client for Erlang/OTP.

## Latest Nine Nines Gun vulnerabilities

- [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-2026-43974: Ninenines gun Denial of Service via unsolicited 101 Switching Protocols](https://junglewise.ai/threats/cve-2026-43974-ninenines-gun-denial-of-service-via-unsolicited-101-switching) (high, CVSS 8.7, published 8 Jun 2026)
- [CVE-2026-43973: ninenines gun uncontrolled resource consumption in gun_http](https://junglewise.ai/threats/cve-2026-43973-ninenines-gun-uncontrolled-resource-consumption-in-gun-http) (high, CVSS 8.7, published 8 Jun 2026)
- [CVE-2026-43972: ninenines gun cross-origin cookie injection in gun_http2](https://junglewise.ai/threats/cve-2026-43972-ninenines-gun-cross-origin-cookie-injection-in-gun-http2) (medium, CVSS 6.3, published 8 Jun 2026)
- [GUN path traversal in static file server](https://junglewise.ai/threats/gun-path-traversal-in-static-file-server-25023cc6) (info, published 5 Jun 2019)

## Most severe Nine Nines Gun vulnerabilities

- [CVE-2026-43974: Ninenines gun Denial of Service via unsolicited 101 Switching Protocols](https://junglewise.ai/threats/cve-2026-43974-ninenines-gun-denial-of-service-via-unsolicited-101-switching) (high, CVSS 8.7, published 8 Jun 2026)
- [CVE-2026-43973: ninenines gun uncontrolled resource consumption in gun_http](https://junglewise.ai/threats/cve-2026-43973-ninenines-gun-uncontrolled-resource-consumption-in-gun-http) (high, CVSS 8.7, published 8 Jun 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-2026-43972: ninenines gun cross-origin cookie injection in gun_http2](https://junglewise.ai/threats/cve-2026-43972-ninenines-gun-cross-origin-cookie-injection-in-gun-http2) (medium, CVSS 6.3, published 8 Jun 2026)
- [GUN path traversal in static file server](https://junglewise.ai/threats/gun-path-traversal-in-static-file-server-25023cc6) (info, published 5 Jun 2019)

## 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 Cowboy](https://junglewise.ai/threats/technologies/cowboy): 3 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 Gun vulnerabilities", https://junglewise.ai/threats/technologies/gun, 9 November 2026.