High severity8.6NVD Advisory· Published Dec 4, 2023· Updated Jun 17, 2026
CVE-2023-49288
CVE-2023-49288
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 "collapsed_forwarding" directive are not vulnerable. This bug is fixed by Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should remove all collapsed_forwarding lines from their squid.conf.
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Affected products
4>= 3.5, < 6.0.1+ 2 more
- (no CPE)range: >= 3.5, < 6.0.1
- (no CPE)range: 3.5 - 5.9
- cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*range: >=3.5,<=5.9
Patches
Vulnerability mechanics
References
4- github.com/squid-cache/squid/security/advisories/GHSA-rj5h-46j6-q2g5nvdVendor Advisory
- lists.fedoraproject.org/archives/list/[email protected]/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/nvd
- lists.fedoraproject.org/archives/list/[email protected]/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/nvd
- security.netapp.com/advisory/ntap-20240119-0006/nvd
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