# CVE-2026-33515: Squid has issues in ICP message handling CVE-2026-33515 is fixed in 7 products on 1 platform, first by DEBIAN-CVE-2026-33515, released March 26, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-33515 - Priority: Routine - CVSS: 6.5 (Moderate) - EPSS: 0.0106 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Mar 25, 2026 - Weakness: Out-of-bounds Read - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33515 ## Description Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This problem allows a remote attacker to receive small amounts of memory potentially containing sensitive information when responding with errors to invalid ICP requests. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero `icp_port`). This problem cannot be mitigated by denying ICP queries using `icp_access` rules. Version 7.5 contains a patch. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | squid Debian 12.15 (bookworm) | 5.7-2+deb12u6 | [DEBIAN-CVE-2026-33515](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33515.md) | Mar 26, 2026 | | Linux | squid Debian 13.5 (trixie) | 6.13-2+deb13u2 | [DEBIAN-CVE-2026-33515](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33515.md) | Mar 26, 2026 | | Linux | squid Debian 14 | 7.5-1 | [DEBIAN-CVE-2026-33515](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33515.md) | Mar 26, 2026 | | Linux | squid Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | [squid 3.5.27-1ubuntu1.14+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-3.5.27-1ubuntu1.14-esm6.md) | Oct 24, 2026 | | Linux | squid Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | [squid 4.10-1ubuntu1.13+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-4.10-1ubuntu1.13-esm3.md) | Oct 24, 2026 | | Linux | squid Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | [squid 5.9-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-5.9-0ubuntu0.22.04.5.md) | Apr 15, 2026 | | Linux | squid Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | [squid 6.14-0ubuntu0.24.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-6.14-0ubuntu0.24.04.2.md) | Apr 15, 2026 | | Linux | squid Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | [squid 6.14-0ubuntu0.25.10.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-6.14-0ubuntu0.25.10.2.md) | Apr 15, 2026 | | Linux | squid opensuse-leap 16.0 | 6.14-160000.1.1 | [OPENSUSE-SU-2026:22080-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22080-1.md) | Nov 7, 2026 | | Linux | squid sles 15.6 | 6.14-150600.3.20.1 | [SUSE-SU-2026:4621-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4621-1.md) | Nov 7, 2026 | | Linux | squid sles 15.7 | 6.14-150600.3.20.1 | [SUSE-SU-2026:4621-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4621-1.md) | Nov 7, 2026 | | Linux | squid sles 16.0 | 6.14-160000.1.1 | [SUSE-SU-2026:24224-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24224-1.md) | Nov 7, 2026 | | Linux | squid-cgi Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | [squid-cgi 3.5.27-1ubuntu1.14+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-cgi-3.5.27-1ubuntu1.14-esm6.md) | Oct 24, 2026 | | Linux | squid-cgi Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | [squid-cgi 4.10-1ubuntu1.13+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-cgi-4.10-1ubuntu1.13-esm3.md) | Oct 24, 2026 | | Linux | squid-cgi Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | [squid-cgi 5.9-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-cgi-5.9-0ubuntu0.22.04.5.md) | Apr 15, 2026 | | Linux | squid-cgi Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | [squid-cgi 6.14-0ubuntu0.24.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-cgi-6.14-0ubuntu0.24.04.2.md) | Apr 15, 2026 | | Linux | squid-cgi Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | [squid-cgi 6.14-0ubuntu0.25.10.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-cgi-6.14-0ubuntu0.25.10.2.md) | Apr 15, 2026 | | Linux | squid-common Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | [squid-common 3.5.27-1ubuntu1.14+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-common-3.5.27-1ubuntu1.14-esm6.md) | Oct 24, 2026 | | Linux | squid-common Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | [squid-common 4.10-1ubuntu1.13+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-common-4.10-1ubuntu1.13-esm3.md) | Oct 24, 2026 | | Linux | squid-common Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | [squid-common 5.9-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-common-5.9-0ubuntu0.22.04.5.md) | Apr 15, 2026 | | Linux | squid-common Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | [squid-common 6.14-0ubuntu0.24.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-common-6.14-0ubuntu0.24.04.2.md) | Apr 15, 2026 | | Linux | squid-common Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | [squid-common 6.14-0ubuntu0.25.10.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-common-6.14-0ubuntu0.25.10.2.md) | Apr 15, 2026 | | Linux | squid-openssl Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | [squid-openssl 5.9-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-openssl-5.9-0ubuntu0.22.04.5.md) | Apr 15, 2026 | | Linux | squid-openssl Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | [squid-openssl 6.14-0ubuntu0.24.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-openssl-6.14-0ubuntu0.24.04.2.md) | Apr 15, 2026 | | Linux | squid-openssl Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | [squid-openssl 6.14-0ubuntu0.25.10.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-openssl-6.14-0ubuntu0.25.10.2.md) | Apr 15, 2026 | | Linux | squid-purge Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | [squid-purge 3.5.27-1ubuntu1.14+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid-purge-3.5.27-1ubuntu1.14-esm6.md) | Oct 24, 2026 | | Linux | squid-purge Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | [squid-purge 4.10-1ubuntu1.13+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squid-purge-4.10-1ubuntu1.13-esm3.md) | Oct 24, 2026 | | Linux | squid-purge Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | [squid-purge 5.9-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-purge-5.9-0ubuntu0.22.04.5.md) | Apr 15, 2026 | | Linux | squid-purge Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | [squid-purge 6.14-0ubuntu0.24.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-purge-6.14-0ubuntu0.24.04.2.md) | Apr 15, 2026 | | Linux | squid-purge Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | [squid-purge 6.14-0ubuntu0.25.10.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-purge-6.14-0ubuntu0.25.10.2.md) | Apr 15, 2026 | | Linux | squid3 Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | [squid3 3.5.27-1ubuntu1.14+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squid3-3.5.27-1ubuntu1.14-esm6.md) | Oct 24, 2026 | | Linux | squidclient Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | [squidclient 3.5.27-1ubuntu1.14+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-squidclient-3.5.27-1ubuntu1.14-esm6.md) | Oct 24, 2026 | | Linux | squidclient Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | [squidclient 4.10-1ubuntu1.13+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-squidclient-4.10-1ubuntu1.13-esm3.md) | Oct 24, 2026 | | Linux | squidclient Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | [squidclient 5.9-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squidclient-5.9-0ubuntu0.22.04.5.md) | Apr 15, 2026 | | Linux | squidclient Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | [squidclient 6.14-0ubuntu0.24.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squidclient-6.14-0ubuntu0.24.04.2.md) | Apr 15, 2026 | | Linux | squidclient Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | [squidclient 6.14-0ubuntu0.25.10.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squidclient-6.14-0ubuntu0.25.10.2.md) | Apr 15, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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