CVE-2022-23634

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure, data tampering.

Exploit odds

2.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2022-02-11 22:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:30 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.1% in the next 30 days (EPSS).
• Severity: 8.0 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2022-02-11 22:15 UTC

Last modified

2026-06-17 04:30 UTC

Exploit probability

2.1% · EPSS, next 30 days

Weakness

CWE-200 · Information exposure

Record status

Modified

Affected

• Puma < 4.3.11
• Puma < 5.6.2
• Rubyonrails Rails < 5.2.6.2
• Rubyonrails Rails < 6.0.4.6
• Rubyonrails Rails < 6.1.4.6
• Rubyonrails Rails < 7.0.2.2
• Debian Linux 9.0
• Debian Linux 10.0

Attack profile CVSS 3.1 · 8.0

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2022-23634.md and follow it. Check whether this project is affected by CVE-2022-23634. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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