# CVE-2026-32748: Squid has Denial of Service in ICP Response handling

CVE-2026-32748 is fixed in 11 products on 1 platform, first by DEBIAN-CVE-2026-32748, released March 26, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-32748
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0907
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 25, 2026
- Weakness: Improper Resource Locking
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32748

## Description

Squid is a caching proxy for the Web. Prior to version 7.5, due to premature release of resource during expected lifetime and heap Use-After-Free bugs, Squid is vulnerable to Denial of Service when handling ICP traffic. This problem allows a remote attacker to perform a reliable and repeatable Denial of Service attack against the Squid service using ICP protocol. 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. This bug is fixed in Squid version 7.5.

## 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-2026:8317](https://patchblox.com/security/data/fix/linux/rhsa-2026-8317.md) | Apr 30, 2026 |
| Linux | libecap almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | [ALSA-2026:8317](https://patchblox.com/security/data/fix/linux/alsa-2026-8317.md) | Apr 15, 2026 |
| Linux | libecap ol 8 | 0:1.0.1-2.module+el8.9.0+90083+f7556140 | [ELSA-2026-8317](https://patchblox.com/security/data/fix/linux/elsa-2026-8317.md) | Apr 16, 2026 |
| Linux | libecap rocky 8 | 0:1.0.1-2.module+el8.9.0+1437+df5ea8f0 | [RLSA-2026:8317](https://patchblox.com/security/data/fix/linux/rlsa-2026-8317.md) | Apr 16, 2026 |
| Linux | libecap-devel RHEL 8 | 0:1.0.1-2.module+el8.9.0+19703+a1da7223 | [RHSA-2026:8317](https://patchblox.com/security/data/fix/linux/rhsa-2026-8317.md) | Apr 30, 2026 |
| Linux | libecap-devel almalinux 8 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | [ALSA-2026:8317](https://patchblox.com/security/data/fix/linux/alsa-2026-8317.md) | Apr 15, 2026 |
| Linux | libecap-devel ol 8 | 0:1.0.1-2.module+el8.9.0+90083+f7556140 | [ELSA-2026-8317](https://patchblox.com/security/data/fix/linux/elsa-2026-8317.md) | Apr 16, 2026 |
| Linux | squid Debian 13.5 (trixie) | 6.13-2+deb13u3 | [DEBIAN-CVE-2026-32748](https://patchblox.com/security/data/fix/linux/debian-cve-2026-32748.md) | Mar 26, 2026 |
| Linux | squid Debian 14 | 7.5-1 | [DEBIAN-CVE-2026-32748](https://patchblox.com/security/data/fix/linux/debian-cve-2026-32748.md) | Mar 26, 2026 |
| Linux | squid Fedora 43 | 7:7.5-1.fc43 | [FEDORA-2026-E6A4814A4D](https://patchblox.com/security/data/fix/linux/fedora-2026-e6a4814a4d.md) | Apr 27, 2026 |
| Linux | squid RHEL 10 | 6.10-5.el10_0.2 | [RHSA-2026:11901](https://patchblox.com/security/data/fix/linux/rhsa-2026-11901.md) | Apr 15, 2026 |
| Linux | squid RHEL 8 | 7:4.15-10.module+el8.10.0+24189+04a20c8a.11 | [RHSA-2026:8317](https://patchblox.com/security/data/fix/linux/rhsa-2026-8317.md) | Apr 30, 2026 |
| Linux | squid RHEL 9 | 7:5.5-22.el9_7.4 | [RHSA-2026:6301](https://patchblox.com/security/data/fix/linux/rhsa-2026-6301.md) | Apr 15, 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 almalinux 10 | 7:6.10-6.el10_1.3 | [ALSA-2026:8119](https://patchblox.com/security/data/fix/linux/alsa-2026-8119.md) | Apr 14, 2026 |
| Linux | squid almalinux 8 | 7:4.15-10.module_el8.10.0+4163+e77fcdac.11 | [ALSA-2026:8317](https://patchblox.com/security/data/fix/linux/alsa-2026-8317.md) | Apr 15, 2026 |
| Linux | squid almalinux 9 | 7:5.5-22.el9_7.4 | [ALSA-2026:6301](https://patchblox.com/security/data/fix/linux/alsa-2026-6301.md) | Mar 31, 2026 |
| Linux | squid amzn 2023 | 7:6.13-1.amzn2023.0.4 | [ALAS2023-2026-1569](https://patchblox.com/security/data/fix/linux/alas2023-2026-1569.md) | Apr 13, 2026 |
| Linux | squid ol 10 | 7:6.10-6.el10_1.3 | [ELSA-2026-8119](https://patchblox.com/security/data/fix/linux/elsa-2026-8119.md) | Apr 14, 2026 |
| Linux | squid ol 8 | 7:4.15-10.module+el8.10.0+90877+04e4d7e0.11 | [ELSA-2026-8317](https://patchblox.com/security/data/fix/linux/elsa-2026-8317.md) | Apr 16, 2026 |
| Linux | squid ol 9 | 7:5.5-22.el9_7.4 | [ELSA-2026-6301](https://patchblox.com/security/data/fix/linux/elsa-2026-6301.md) | Mar 31, 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 rocky 10 | 7:6.10-6.el10_1.3 | [RLSA-2026:8119](https://patchblox.com/security/data/fix/linux/rlsa-2026-8119.md) | Apr 15, 2026 |
| Linux | squid rocky 8 | 7:4.15-10.module+el8.10.0+1928+e8441768.5 | [RLSA-2026:8317](https://patchblox.com/security/data/fix/linux/rlsa-2026-8317.md) | Apr 16, 2026 |
| Linux | squid rocky 9 | 7:5.5-22.el9_7.4 | [RLSA-2026:6301](https://patchblox.com/security/data/fix/linux/rlsa-2026-6301.md) | Apr 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-debuginfo Fedora 43 | 7:7.5-1.fc43 | [FEDORA-2026-E6A4814A4D](https://patchblox.com/security/data/fix/linux/fedora-2026-e6a4814a4d.md) | Apr 27, 2026 |
| Linux | squid-debuginfo amzn 2023 | 7:6.13-1.amzn2023.0.4 | [ALAS2023-2026-1569](https://patchblox.com/security/data/fix/linux/alas2023-2026-1569.md) | Apr 13, 2026 |
| Linux | squid-debugsource Fedora 43 | 7:7.5-1.fc43 | [FEDORA-2026-E6A4814A4D](https://patchblox.com/security/data/fix/linux/fedora-2026-e6a4814a4d.md) | Apr 27, 2026 |
| Linux | squid-debugsource amzn 2023 | 7:6.13-1.amzn2023.0.4 | [ALAS2023-2026-1569](https://patchblox.com/security/data/fix/linux/alas2023-2026-1569.md) | Apr 13, 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 2026-11-08T19:12:23Z 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

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