# puma (RubyGems) vulnerabilities

Source: https://junglewise.ai/threats/technologies/puma  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/puma.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 15 vulnerabilities in puma (RubyGems): 0 in the last 7 days and 1 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-68006, was published on 10 September 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 15 (1 critical, 0 exploited in the wild)

## About puma (RubyGems)

A multi-threaded HTTP server for Ruby and Rack applications.

## Latest puma (RubyGems) vulnerabilities

- [CVE-2026-68006: Puma HTTP request smuggling via underscore header parsing](https://junglewise.ai/threats/cve-2026-68006-puma-http-request-smuggling-via-underscore-header-parsing) (critical, CVSS 9.1, published 10 Sep 2026)
- [CVE-2026-47737: Puma source IP spoofing via PROXY protocol injection](https://junglewise.ai/threats/cve-2026-47737-puma-source-ip-spoofing-via-proxy-protocol-injection) (high, CVSS 7.5, published 14 Jul 2026)
- [CVE-2026-47736: Puma uncontrolled resource consumption in PROXY protocol v1 parser](https://junglewise.ai/threats/cve-2026-47736-puma-uncontrolled-resource-consumption-in-proxy-protocol-v1) (high, CVSS 7.5, published 14 Jul 2026)
- [CVE-2024-45614: Puma's header normalization allows for client to clobber proxy set headers](https://junglewise.ai/threats/cve-2024-45614-puma-s-header-normalization-allows-for-client-to-clobber-proxy) (low, CVSS 3.1, published 20 Sep 2024)
- [CVE-2024-21647: Puma HTTP Request/Response Smuggling vulnerability](https://junglewise.ai/threats/cve-2024-21647-puma-http-request-response-smuggling-vulnerability) (low, CVSS 3.1, published 8 Jan 2024)
- [CVE-2023-40175: Puma HTTP Request/Response Smuggling vulnerability](https://junglewise.ai/threats/cve-2023-40175-puma-http-request-response-smuggling-vulnerability) (low, CVSS 3.1, published 18 Aug 2023)
- [CVE-2022-24790: Puma vulnerable to HTTP Request Smuggling](https://junglewise.ai/threats/cve-2022-24790-puma-vulnerable-to-http-request-smuggling) (low, CVSS 3.1, published 30 Mar 2022)
- [CVE-2022-23634: Puma used with Rails may lead to Information Exposure](https://junglewise.ai/threats/cve-2022-23634-puma-used-with-rails-may-lead-to-information-exposure) (low, CVSS 3.1, published 11 Feb 2022)
- [CVE-2021-41136: Puma with proxy which forwards LF characters as line endings could allow HTTP request smuggling](https://junglewise.ai/threats/cve-2021-41136-puma-with-proxy-which-forwards-lf-characters-as-line-endings) (low, CVSS 3.1, published 12 Oct 2021)
- [CVE-2021-29509: Puma's Keepalive Connections Causing Denial Of Service](https://junglewise.ai/threats/cve-2021-29509-puma-s-keepalive-connections-causing-denial-of-service) (low, CVSS 3.1, published 18 May 2021)
- [CVE-2020-11077: HTTP Smuggling via Transfer-Encoding Header in Puma](https://junglewise.ai/threats/cve-2020-11077-http-smuggling-via-transfer-encoding-header-in-puma) (low, CVSS 3.1, published 22 May 2020)
- [CVE-2020-11076: HTTP Smuggling via Transfer-Encoding Header in Puma](https://junglewise.ai/threats/cve-2020-11076-http-smuggling-via-transfer-encoding-header-in-puma) (low, CVSS 3.1, published 22 May 2020)
- [CVE-2020-5249: HTTP Response Splitting (Early Hints) in Puma](https://junglewise.ai/threats/cve-2020-5249-http-response-splitting-early-hints-in-puma) (low, CVSS 3.1, published 3 Mar 2020)
- [CVE-2020-5247: HTTP Response Splitting in Puma](https://junglewise.ai/threats/cve-2020-5247-http-response-splitting-in-puma) (low, CVSS 3.1, published 28 Feb 2020)
- [CVE-2019-16770: A poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack](https://junglewise.ai/threats/cve-2019-16770-a-poorly-behaved-client-could-use-keepalive-requests-to) (low, CVSS 3.1, published 5 Dec 2019)

## Most severe puma (RubyGems) vulnerabilities

- [CVE-2026-68006: Puma HTTP request smuggling via underscore header parsing](https://junglewise.ai/threats/cve-2026-68006-puma-http-request-smuggling-via-underscore-header-parsing) (critical, CVSS 9.1, published 10 Sep 2026)
- [CVE-2026-47736: Puma uncontrolled resource consumption in PROXY protocol v1 parser](https://junglewise.ai/threats/cve-2026-47736-puma-uncontrolled-resource-consumption-in-proxy-protocol-v1) (high, CVSS 7.5, published 14 Jul 2026)
- [CVE-2026-47737: Puma source IP spoofing via PROXY protocol injection](https://junglewise.ai/threats/cve-2026-47737-puma-source-ip-spoofing-via-proxy-protocol-injection) (high, CVSS 7.5, published 14 Jul 2026)
- [CVE-2020-11076: HTTP Smuggling via Transfer-Encoding Header in Puma](https://junglewise.ai/threats/cve-2020-11076-http-smuggling-via-transfer-encoding-header-in-puma) (low, CVSS 3.1, published 22 May 2020)
- [CVE-2020-11077: HTTP Smuggling via Transfer-Encoding Header in Puma](https://junglewise.ai/threats/cve-2020-11077-http-smuggling-via-transfer-encoding-header-in-puma) (low, CVSS 3.1, published 22 May 2020)
- [CVE-2020-5247: HTTP Response Splitting in Puma](https://junglewise.ai/threats/cve-2020-5247-http-response-splitting-in-puma) (low, CVSS 3.1, published 28 Feb 2020)
- [CVE-2022-24790: Puma vulnerable to HTTP Request Smuggling](https://junglewise.ai/threats/cve-2022-24790-puma-vulnerable-to-http-request-smuggling) (low, CVSS 3.1, published 30 Mar 2022)
- [CVE-2022-23634: Puma used with Rails may lead to Information Exposure](https://junglewise.ai/threats/cve-2022-23634-puma-used-with-rails-may-lead-to-information-exposure) (low, CVSS 3.1, published 11 Feb 2022)
- [CVE-2019-16770: A poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack](https://junglewise.ai/threats/cve-2019-16770-a-poorly-behaved-client-could-use-keepalive-requests-to) (low, CVSS 3.1, published 5 Dec 2019)
- [CVE-2021-29509: Puma's Keepalive Connections Causing Denial Of Service](https://junglewise.ai/threats/cve-2021-29509-puma-s-keepalive-connections-causing-denial-of-service) (low, CVSS 3.1, published 18 May 2021)

## 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 | 1 | 1 | 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 RubyGems technologies

- [actionpack (RubyGems)](https://junglewise.ai/threats/technologies/actionpack): 77 vulnerabilities
- [nokogiri (RubyGems)](https://junglewise.ai/threats/technologies/nokogiri): 69 vulnerabilities
- [rack (RubyGems)](https://junglewise.ai/threats/technologies/rack): 55 vulnerabilities
- [activerecord (RubyGems)](https://junglewise.ai/threats/technologies/rubygems-activerecord): 26 vulnerabilities
- [rubygems-update (RubyGems)](https://junglewise.ai/threats/technologies/rubygems-update): 25 vulnerabilities
- [puppet (RubyGems)](https://junglewise.ai/threats/technologies/puppet): 23 vulnerabilities
- [activesupport (RubyGems)](https://junglewise.ai/threats/technologies/activesupport): 20 vulnerabilities
- [actionview (RubyGems)](https://junglewise.ai/threats/technologies/actionview): 19 vulnerabilities
- [activestorage (RubyGems)](https://junglewise.ai/threats/technologies/activestorage): 19 vulnerabilities
- [camaleon_cms (RubyGems)](https://junglewise.ai/threats/technologies/camaleon-cms): 19 vulnerabilities
- [rails-html-sanitizer (RubyGems)](https://junglewise.ai/threats/technologies/rails-html-sanitizer): 18 vulnerabilities
- [loofah (RubyGems)](https://junglewise.ai/threats/technologies/loofah): 17 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, "puma (RubyGems) vulnerabilities", https://junglewise.ai/threats/technologies/puma, 13 November 2026.