DEBIAN-CVE-2021-29509

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Source
https://security-tracker.debian.org/tracker/CVE-2021-29509
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-29509.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2021-29509
Upstream
Published
2021-05-11T17:15:07Z
Modified
2025-09-19T06:03:26Z
Summary
[none]
Details

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.

References

Affected packages

Debian:11 / puma

Package

Name
puma
Purl
pkg:deb/debian/puma?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.3.8-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / puma

Package

Name
puma
Purl
pkg:deb/debian/puma?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.3.8-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / puma

Package

Name
puma
Purl
pkg:deb/debian/puma?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.3.8-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / puma

Package

Name
puma
Purl
pkg:deb/debian/puma?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.3.8-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}