Moderate severityNVD Advisory· Published Jan 8, 2024· Updated Nov 3, 2025
HTTP Request/Response Smuggling in puma
CVE-2024-21647
Description
Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pumaRubyGems | >= 6.0.0, < 6.4.2 | 6.4.2 |
pumaRubyGems | < 5.6.8 | 5.6.8 |
Affected products
13- osv-coords12 versionspkg:apk/chainguard/ruby3.2-pumapkg:apk/wolfi/ruby3.2-pumapkg:deb/ubuntu/puma@5.6.5-4ubuntu2.1?arch=source&distro=manticpkg:gem/pumapkg:rpm/opensuse/rubygem-puma&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/rubygem-puma&distro=openSUSE%20Leap%2015.6pkg:rpm/suse/rubygem-puma&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP2pkg:rpm/suse/rubygem-puma&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP3pkg:rpm/suse/rubygem-puma&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP4pkg:rpm/suse/rubygem-puma&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP5pkg:rpm/suse/rubygem-puma&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP6pkg:rpm/suse/rubygem-puma&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP7
< 6.4.2-r0+ 11 more
- (no CPE)range: < 6.4.2-r0
- (no CPE)range: < 6.4.2-r0
- (no CPE)range: < 5.6.5-4ubuntu2.1
- (no CPE)range: >= 6.0.0, < 6.4.2
- (no CPE)range: < 4.3.12-150000.3.15.1
- (no CPE)range: < 5.6.9-150600.18.3.1
- (no CPE)range: < 4.3.12-150000.3.15.1
- (no CPE)range: < 4.3.12-150000.3.15.1
- (no CPE)range: < 4.3.12-150000.3.15.1
- (no CPE)range: < 4.3.12-150000.3.15.1
- (no CPE)range: < 5.6.9-150600.18.3.1
- (no CPE)range: < 5.6.9-150600.18.3.1
- puma/pumav5Range: < 5.6.8
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-c2f4-cvqm-65w2ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2024-21647ghsaADVISORY
- github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93ghsax_refsource_MISCWEB
- github.com/puma/puma/commit/60d5ee3734adc8cee85c3f0561af392448fe19b7ghsaWEB
- github.com/puma/puma/commit/bbb880ffb6debbfdea535b4b3eb2204d49ae151dghsaWEB
- github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2ghsax_refsource_CONFIRMWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2024-21647.ymlghsaWEB
- lists.debian.org/debian-lts-announce/2024/11/msg00004.htmlghsaWEB
News mentions
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