Detections
Analytics

SCA: security update for puma (GHSA-q28m-8xjw-8vr5)

high Tenable Cloud Security Plugin ID 417797

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Puma is a concurrent HTTP 1.1 server for Ruby/Rack applications. The fix for CVE-2019-16770 was
 incomplete. The original fix only protected existing connections that had already been accepted from
 having their requests starved by greedy persistent-connections saturating all threads in the same process.
 However, new connections may still be starved by greedy persistent-connections saturating all threads in
 all processes in the cluster. A `puma` server which received more concurrent `keep-alive` connections than
 the server had threads in its threadpool would service only a subset of connections, denying service to
 the unserved connections. This problem has been fixed in `puma` 4.3.8 and 5.3.1. Setting `queue_requests
 false` also fixes the issue. This is not advised when using `puma` without a reverse proxy, such as
 `nginx` or `apache`, because you will open yourself to slow client attacks (e.g. slowloris). The fix is
 very small and a git patch is available for those using unsupported versions of Puma. (CVE-2021-29509)

See Also

https://github.com/advisories/GHSA-q28m-8xjw-8vr5

Plugin Details

Severity: High

ID: 417797

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 1/23/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.71

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2021-29509

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/18/2021

Vulnerability Publication Date: 5/11/2021

Reference Information

CVE: CVE-2021-29509

cwe: CWE-400