# CVE-2024-23638: squid: Squid is a caching proxy for the Web CVE-2024-23638 is fixed in 10 products on 1 platform, first by DEBIAN-CVE-2024-23638, released January 24, 2024. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2024-23638 - Priority: Routine - CVSS: 6.5 (Medium) - EPSS: 0.6005 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jan 23, 2024 ## Description Squid is a caching proxy for the Web. Due to an expired pointer referencebug, Squid prior to version 6.6 is vulnerable to a Denial of Service attackagainst Cache Manager error responses. This problem allows a trusted clientto perform Denial of Service when generating error pages for Client Managerreports. Squid older than 5.0.5 have not been tested and should be assumedto be vulnerable. All Squid-5.x up to and including 5.9 are vulnerable. AllSquid-6.x up to and including 6.5 are vulnerable. This bug is fixed bySquid version 6.6. In addition, patches addressing this problem for thestable releases can be found in Squid's patch archives. As a workaround,prevent access to Cache Manager using Squid's main access control:`http_access deny manager`. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libecap RHEL 8 | 0:1.0.1-2.module+el8.9.0+19703+a1da7223 | [RHSA-2024:9644](https://patchblox.com/security/data/fix/linux/rhsa-2024-9644.md) | Nov 14, 2024 | | Linux | libecap almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | [ALSA-2024:9644](https://patchblox.com/security/data/fix/linux/alsa-2024-9644.md) | Nov 14, 2024 | | Linux | libecap ol 8 | 0:1.0.1-2.module+el8.9.0+90083+f7556140 | [ELSA-2024-9644](https://patchblox.com/security/data/fix/linux/elsa-2024-9644.md) | Nov 15, 2024 | | Linux | libecap rocky 8 | 0:1.0.1-2.module+el8.9.0+1437+df5ea8f0 | [RLSA-2024:9644](https://patchblox.com/security/data/fix/linux/rlsa-2024-9644.md) | Nov 19, 2024 | | Linux | libecap-devel RHEL 8 | 0:1.0.1-2.module+el8.9.0+19703+a1da7223 | [RHSA-2024:9644](https://patchblox.com/security/data/fix/linux/rhsa-2024-9644.md) | Nov 14, 2024 | | Linux | libecap-devel almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | [ALSA-2024:9644](https://patchblox.com/security/data/fix/linux/alsa-2024-9644.md) | Nov 14, 2024 | | Linux | libecap-devel ol 8 | 0:1.0.1-2.module+el8.9.0+90083+f7556140 | [ELSA-2024-9644](https://patchblox.com/security/data/fix/linux/elsa-2024-9644.md) | Nov 15, 2024 | | Linux | squid Debian 12.15 (bookworm) | 5.7-2+deb12u1 | [DEBIAN-CVE-2024-23638](https://patchblox.com/security/data/fix/linux/debian-cve-2024-23638.md) | Jan 24, 2024 | | Linux | squid Debian 13.5 (trixie) | 6.6-1 | [DEBIAN-CVE-2024-23638](https://patchblox.com/security/data/fix/linux/debian-cve-2024-23638.md) | Jan 24, 2024 | | Linux | squid Debian 14 | 6.6-1 | [DEBIAN-CVE-2024-23638](https://patchblox.com/security/data/fix/linux/debian-cve-2024-23638.md) | Jan 24, 2024 | | Linux | squid RHEL 8 | 7:4.15-10.module+el8.10.0+22489+b920747d.3 | [RHSA-2024:9644](https://patchblox.com/security/data/fix/linux/rhsa-2024-9644.md) | Nov 14, 2024 | | Linux | squid RHEL 9 | 7:5.5-13.el9_4 | [RHSA-2024:4861](https://patchblox.com/security/data/fix/linux/rhsa-2024-4861.md) | Jul 25, 2024 | | Linux | squid Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.10 | [squid 4.10-1ubuntu1.10](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-4.10-1ubuntu1.10.md) | Mar 6, 2024 | | Linux | squid Ubuntu 22.04.1 LTS (jammy) | 5.7-0ubuntu0.22.04.4 | [squid 5.7-0ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-5.7-0ubuntu0.22.04.4.md) | Aug 1, 2025 | | Linux | squid Ubuntu 24.10 (oracular) | 6.6-1ubuntu1 | [squid 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squid Ubuntu 25.04 (plucky) | 6.6-1ubuntu1 | [squid 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squid almalinux 8 | 7:4.15-10.module_el8.10.0+3916+ed00a4a0.3 | [ALSA-2024:9644](https://patchblox.com/security/data/fix/linux/alsa-2024-9644.md) | Nov 14, 2024 | | Linux | squid almalinux 9 | 7:5.5-13.el9_4 | [ALSA-2024:4861](https://patchblox.com/security/data/fix/linux/alsa-2024-4861.md) | Jul 25, 2024 | | Linux | squid amzn 2023 | 7:6.6-1.amzn2023.0.3 | [ALAS2023-2024-578](https://patchblox.com/security/data/fix/linux/alas2023-2024-578.md) | Mar 27, 2024 | | Linux | squid ol 8 | 7:4.15-10.module+el8.10.0+90442+8ef3f586.3 | [ELSA-2024-9644](https://patchblox.com/security/data/fix/linux/elsa-2024-9644.md) | Nov 15, 2024 | | Linux | squid ol 9 | 7:5.5-13.el9_4 | [ELSA-2024-4861](https://patchblox.com/security/data/fix/linux/elsa-2024-4861.md) | Jul 25, 2024 | | Linux | squid rocky 8 | 7:4.15-10.module+el8.10.0+1758+80ba9f4b | [RLSA-2024:9644](https://patchblox.com/security/data/fix/linux/rlsa-2024-9644.md) | Nov 19, 2024 | | Linux | squid rocky 9 | 7:5.5-13.el9_4 | [RLSA-2024:4861](https://patchblox.com/security/data/fix/linux/rlsa-2024-4861.md) | Jul 26, 2024 | | Linux | squid-cgi Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.10 | [squid-cgi 4.10-1ubuntu1.10](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-cgi-4.10-1ubuntu1.10.md) | Mar 6, 2024 | | Linux | squid-cgi Ubuntu 22.04.1 LTS (jammy) | 5.7-0ubuntu0.22.04.4 | [squid-cgi 5.7-0ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-cgi-5.7-0ubuntu0.22.04.4.md) | Aug 1, 2025 | | Linux | squid-cgi Ubuntu 24.10 (oracular) | 6.6-1ubuntu1 | [squid-cgi 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-cgi-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squid-cgi Ubuntu 25.04 (plucky) | 6.6-1ubuntu1 | [squid-cgi 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-cgi-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squid-common Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.10 | [squid-common 4.10-1ubuntu1.10](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-common-4.10-1ubuntu1.10.md) | Mar 6, 2024 | | Linux | squid-common Ubuntu 22.04.1 LTS (jammy) | 5.7-0ubuntu0.22.04.4 | [squid-common 5.7-0ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-common-5.7-0ubuntu0.22.04.4.md) | Aug 1, 2025 | | Linux | squid-common Ubuntu 24.10 (oracular) | 6.6-1ubuntu1 | [squid-common 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-common-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squid-common Ubuntu 25.04 (plucky) | 6.6-1ubuntu1 | [squid-common 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-common-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squid-debuginfo amzn 2023 | 7:6.6-1.amzn2023.0.3 | [ALAS2023-2024-578](https://patchblox.com/security/data/fix/linux/alas2023-2024-578.md) | Mar 27, 2024 | | Linux | squid-debugsource amzn 2023 | 7:6.6-1.amzn2023.0.3 | [ALAS2023-2024-578](https://patchblox.com/security/data/fix/linux/alas2023-2024-578.md) | Mar 27, 2024 | | Linux | squid-openssl Ubuntu 22.04.1 LTS (jammy) | 5.7-0ubuntu0.22.04.4 | [squid-openssl 5.7-0ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-openssl-5.7-0ubuntu0.22.04.4.md) | Aug 1, 2025 | | Linux | squid-openssl Ubuntu 24.10 (oracular) | 6.6-1ubuntu1 | [squid-openssl 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-openssl-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squid-openssl Ubuntu 25.04 (plucky) | 6.6-1ubuntu1 | [squid-openssl 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-openssl-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squid-purge Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.10 | [squid-purge 4.10-1ubuntu1.10](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-purge-4.10-1ubuntu1.10.md) | Mar 6, 2024 | | Linux | squid-purge Ubuntu 22.04.1 LTS (jammy) | 5.7-0ubuntu0.22.04.4 | [squid-purge 5.7-0ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-purge-5.7-0ubuntu0.22.04.4.md) | Aug 1, 2025 | | Linux | squid-purge Ubuntu 24.10 (oracular) | 6.6-1ubuntu1 | [squid-purge 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squid-purge-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squid-purge Ubuntu 25.04 (plucky) | 6.6-1ubuntu1 | [squid-purge 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squid-purge-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squidclient Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.10 | [squidclient 4.10-1ubuntu1.10](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squidclient-4.10-1ubuntu1.10.md) | Mar 6, 2024 | | Linux | squidclient Ubuntu 22.04.1 LTS (jammy) | 5.7-0ubuntu0.22.04.4 | [squidclient 5.7-0ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squidclient-5.7-0ubuntu0.22.04.4.md) | Aug 1, 2025 | | Linux | squidclient Ubuntu 24.10 (oracular) | 6.6-1ubuntu1 | [squidclient 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-squidclient-6.6-1ubuntu1.md) | Jan 16, 2026 | | Linux | squidclient Ubuntu 25.04 (plucky) | 6.6-1ubuntu1 | [squidclient 6.6-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-squidclient-6.6-1ubuntu1.md) | Jan 16, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.