CVE-2023-40175
criticalpriority · track · 39EPSS 0.008 · 58 %ileEURUUSEPSS · scored 2026-10-27
Puma is a Ruby/Rack web server built for parallelism. Prior to versions 6.3.1 and 5.6.7, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in a way that allowed HTTP request smuggling. Severity of this issue is highly dependent on the nature of the web site using puma is. This could be caused by either incorrect parsing of trailing fields in chunked transfer encoding bodies or by parsing of blank/zero-length Content-Length headers. Both issues have been addressed and this vulnerability has been fixed in versions 6.3.1 and 5.6.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.3–9.8
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (10)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-68xg-gqqm-vgj8Puma HTTP Request/Response Smuggling vulnerability2023-08-18ghsa · osvUS
### Impact Prior to version 6.3.1, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in a way that allowed HTTP request smuggling. The following vulnerabilities are addressed by this advisory: * Incorrect parsing of trailing fields in chunked transfer encoding bodies * Parsing of blank/zero-length Content-Length headers ### Patches The vulnerability has been fixed in 6.3.1 and 5.6.7. ### Workarounds No known workarounds. ### References [HTTP Request Smuggling](https://portswigger.net/web-security/request-smuggling) ### For more information If you have any questions or comments about this advisory: Open an issue in [Puma](https://github.com/puma/puma) See our [security policy](https://github.com/puma/puma/security/policy)
also known as (4)
Other names and identifiers for this entity.
sources
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references (7)
External citations — patches, advisories, analysis.
- https://cxsecurity.com/cveshow/CVE-2023-40175/cnnvd
- https://github.com/puma/puma/commit/690155e7d644b80eeef0a6094f9826ee41f1080acnnvd
- https://github.com/puma/puma/security/advisories/GHSA-68xg-gqqm-vgj8cnnvd
- https://github.com/puma/puma/commit/690155e7d644b80eeef0a6094f9826ee41f1080aenisa_euvd
- https://github.com/puma/puma/security/advisories/GHSA-68xg-gqqm-vgj8enisa_euvd
- https://github.com/puma/puma/commit/690155e7d644b80eeef0a6094f9826ee41f1080aPatchnvd
- https://github.com/puma/puma/security/advisories/GHSA-68xg-gqqm-vgj8Vendor Advisorynvd
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