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CVE-2023-49288

SQUID-2023:9 Denial of Service in HTTP Collapsed Forwarding

Severity
High 7.5
Published
2 Dec 2023
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
6.0.1
Also known as
GHSA-rj5h-46j6-q2g5
Sources
NVD, Project advisories (GitHub)

Description

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Affected versions of squid are subject to a a Use-After-Free bug which can lead to a Denial of Service attack via collapsed forwarding. All versions of Squid from 3.5 up to and including 5.9 configured with "collapsed_forwarding on" are vulnerable. Configurations with "collapsed_forwarding off" or without a…

Affected software

SoftwareAffected versions
SquidServers and applications · cpe:a:squid-cache:squid
  • From 3.5 up to 5.9
SquidServers and applications · github:squid-cache/squid
  • From 3.5 before 6.0.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2023-49288
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2023-49288
  • GitHub Advisory Database https://github.com/advisories/GHSA-rj5h-46j6-q2g5
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-rj5h-46j6-q2g5