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TI-2023-21048 Aliases CVE-2023-40175GHSA-68xg-gqqm-vgj8

Inconsistent Interpretation of HTTP Requests in puma

Priority MEDIUM 50CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 1 fixed, 3 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00847 58th percentileScored 2026-11-07
Fix Partial puma (puma): 5.6.7, 6.3.1puma (RubyGems): 5.6.7, 6.3.1Red Hat: 1 advisoryRed Hat: 1 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
pumapumabefore 5.6.7; 6.0.0 to before 6.3.15.6.7, 6.3.1Patch availableCNA
—puma (RubyGems)before 5.6.75.6.7Patch availableGHSA-68xg-gqqm-vgj8
—puma (RubyGems)6.0.0 to before 6.3.16.3.1Patch availableGHSA-68xg-gqqm-vgj8
  • puma Vendorpuma Affected before 5.6.7; 6.0.0 to before 6.3.1 Fixed in 5.6.7, 6.3.1 Patch available CNA
  • puma (RubyGems) Vendor— Affected before 5.6.7 Fixed in 5.6.7 Patch available GHSA-68xg-gqqm-vgj8
  • puma (RubyGems) Vendor— Affected 6.0.0 to before 6.3.1 Fixed in 6.3.1 Patch available GHSA-68xg-gqqm-vgj8

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*before 5.6.7; 6.0.0 to before 6.3.1Vulnerablepuma
  • cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:* Versions before 5.6.7; 6.0.0 to before 6.3.1 Vulnerable ·puma

Remediation

  • Fix · CNA puma (puma) Fixed in 5.6.7, 6.3.1
  • Fix · GHSA-68xg-gqqm-vgj8 puma (RubyGems) Fixed in 5.6.7 Advisory →
  • Fix · GHSA-68xg-gqqm-vgj8 puma (RubyGems) Fixed in 6.3.1 Advisory →

Red Hat 1 advisory

  • RHSA-2024:0797 Released 2024-02-13 · Red Hat rating Important
    Satellite 6.14.2 Async Security Update
    • Red Hat Satellite 6.14 for RHEL 8 candlepin-4.3.11-1.el8sat, candlepin-selinux-4.3.11-1.el8sat, mosquitto-2.0.17-1.el8sat +5

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat 3scale API Management Platform 2AffectedNo fix yet
Red Hat Satellite 6AffectedNo fix yet
Red Hat Storage 3AffectedNo fix planned: Will not fix
Red Hat Satellite 6.14 for RHEL 8Fixed RHSA-2024:0797
Not affected: 1 product
  • Red Hat Satellite 6.14 for RHEL 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-40175
  2. 2026-10-03 Alias added: GHSA-68xg-gqqm-vgj8

References

Patch 1

Advisory 2

Other 6

  • TI-2022-08603 HTTP Request Smuggling in puma CVSS 3.1CRITICAL 9.1
  • TI-2022-07686 Information Exposure when using Puma with Rails CVSS 3.1HIGH 8.0
  • TI-2020-08950 HTTP Smuggling via Transfer-Encoding Header in Puma CVSS 3.1HIGH 7.5
  • TI-2020-08951 HTTP Smuggling via Transfer-Encoding Header in Puma CVSS 3.1HIGH 7.5
  • TI-2020-04303 HTTP Response Splitting in Puma CVSS 3.1HIGH 7.5
  • TI-2019-12551 Potential DOS attack in Puma CVSS 3.1HIGH 7.5
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences