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cnvd-2019-45157

EUVD-2026-58019

fkie_cve-2019-16770

In Puma before versions 3.12.2 and 4.3.1, a poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack. If more keepalive connections to Puma are opened than there are threads available, additional connections will wait permanently if the attacker sends requests frequently enough. This vulnerability is patched in Puma 4.3.1 and 3.12.2.

GHSA-7xx3-m584-x994 — A poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack

Affected: RubyGems: puma

## Keepalive thread overload/DoS

### Impact

A poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack.

If more keepalive connections to Puma are opened than there are threads available, additional connections will wait permanently if the attacker sends requests frequently enough.

### Patches

This vulnerability is patched in Puma 4.3.1 and 3.12.2.

### Workarounds

Reverse proxies in front of Puma could be configured to always allow less than X keepalive connections to a Puma cluster or process, where X is the number of threads configured in Puma's thread pool.

### For more information

If you have any questions or comments about this advisory:

* Open an issue at [puma](github.com/puma/puma).

gsd-2019-16770

openSUSE-SU-2020:1993-1 — Security update for rmt-server

Security update for rmt-server

SUSE-SU-2020:2060-1 — Security update for rubygem-puma

Security update for rubygem-puma

Withdrawn: UBUNTU-CVE-2019-16770

Withdrawn by the publisher.

Affected: Ubuntu:20.04:LTS: puma