CVE-2024-21647
MEDIUM5.9EPSS 2.5%Puma HTTP Request/Response Smuggling vulnerability
Published: 1/8/2024Modified: 2/4/2026
Description
### Impact Prior to versions 6.4.2 and 5.6.8, puma exhibited dangerous behavior when parsing chunked transfer encoding bodies. Fixed versions limit the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. ### Patches The vulnerability has been fixed in 6.4.2 and 5.6.8. ### Workarounds No known workarounds. ### References * [HTTP Request Smuggling](https://portswigger.net/web-security/request-smuggling) * Open an issue in [Puma](https://github.com/puma/puma) * See our [security policy](https://github.com/puma/puma/security/policy)
Affected packages (3)
- Debian/pumafrom 0, < 4.3.8-1+deb11u3
- Debian/pumafrom 0, < 4.3.8-1+deb11u3
- RubyGems/puma>= 6.0.0, < 6.4.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (9)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2024-21647
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2024-21647
- PATCHhttps://github.com/puma/puma
- WEBhttps://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93
- WEBhttps://github.com/puma/puma/commit/60d5ee3734adc8cee85c3f0561af392448fe19b7
- WEBhttps://github.com/puma/puma/commit/bbb880ffb6debbfdea535b4b3eb2204d49ae151d
- WEBhttps://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2
- WEBhttps://github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2024-21647.yml
- WEBhttps://lists.debian.org/debian-lts-announce/2024/11/msg00004.html