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

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.020, the 81st percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 5 Dec 2019, 07:19 UTC Published by the maintainers as a GitHub repository advisory

Sources

• GitHub Advisory Database: GHSA-7xx3-m584-x994
• OSV: GHSA-7xx3-m584-x994
• github.com/puma/puma/security/advisories/GHSA-7xx3-m584-x994
• nvd.nist.gov/vuln/detail/CVE-2019-16770
• github.com/advisories/GHSA-7xx3-m584-x994
• github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2019-16770.yml
• lists.debian.org/debian-lts-announce/2022/05/msg00034.html

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.