vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2022-23634

Information Exposure when using Puma with Rails

MEDIUM
5.9
CVSS Score
Published: February 11, 2022 at 09:40 PM UTC
Updated: June 17, 2026 at 04:30 AM UTC
4 products affected across 4 vendorsDebian LinuxFedoraRails

Using puma by puma?

Get instant alerts when new vulnerabilities affect puma - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM5.9
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

Puma is a Ruby/Rack web server built for parallelism. Prior to `puma` version `5.6.2`, `puma` may not always call `close` on the response body. Rails, prior to version `7.0.2.2`, depended on the response body being closed in order for its `CurrentAttributes` implementation to work correctly. The combination of these two behaviors (Puma not closing the body + Rails' Executor implementation) causes information leakage. This problem is fixed in Puma versions 5.6.2 and 4.3.11. This problem is fixed in Rails versions 7.02.2, 6.1.4.6, 6.0.4.6, and 5.2.6.2. Upgrading to a patched Rails _or_ Puma version fixes the vulnerability.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.011.09.0
Fedora· Fedora Projectrpm
95%
353637
Puma· Pumarubygems
95%
v < 4.3.11v < 5.6.25.0.0 ≤ v < 5.6.2
Affected range stops below 4.3.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.6.2, so it looks safe — our inference, not a vendor statement
Rails· Rubyonrails
95%
5.0.0 ≤ v < 5.2.6.26.0.0 ≤ v < 6.0.4.66.1.0 ≤ v < 6.1.4.67.0.0 ≤ v < 7.0.2.2
Affected range stops below 5.2.6.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.0.4.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.4.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.2.2, so it looks safe — our inference, not a vendor statement

References (12)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/advisories/GHSA-rmj8-8hhh-gv5h
x_refsource_MISCMitigationNot ApplicableThird Party Advisory
Source: [email protected]
https://github.com/advisories/GHSA-wh98-p28r-vrc9
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/puma/puma/commit/b70f451fe8abc0cff192c065d549778452e155bb
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/puma/puma/security/advisories/GHSA-rmj8-8hhh-gv5h
x_refsource_MISCMailing ListMitigationPatchThird Party Advisory
Source: [email protected]
https://groups.google.com/g/ruby-security-ann/c/FkTM-_7zSNA/m/K2RiMJBlBAAJ?utm_medium=email&utm_source=footer&pli=1
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/05/msg00034.html
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F6YWGIIKL7KKTS3ZOAYMYPC7D6WQ5OA5/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200CWE-404

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card