# CVE-2026-50012: Squid: Memory corruption in cache_digest reply handling

CVE-2026-50012 is fixed in 9 products on 1 platform, first by squid 7.2-2ubuntu2.2, released June 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-50012
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0136
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 11, 2026
- Weakness: Improper Input Validation
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50012

## Description

Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's on-the-wire size may be larger than the mask_size declared within the digest, so a trusted peer sending a maliciously crafted reply to a cache_digest request message can trigger the overflow. This attack is limited to Squid instances compiled with the --enable-cache-digests option and configured with cache_peer entries. This issue is fixed in version 7.6.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | squid Debian 12.15 (bookworm) | 5.7-2+deb12u6 | [DEBIAN-CVE-2026-50012](https://patchblox.com/security/data/fix/linux/debian-cve-2026-50012.md) | Jun 24, 2026 |
| Linux | squid Debian 13.5 (trixie) | 6.13-2+deb13u2 | [DEBIAN-CVE-2026-50012](https://patchblox.com/security/data/fix/linux/debian-cve-2026-50012.md) | Jun 24, 2026 |
| Linux | squid Debian 14 | 7.6-1 | [DEBIAN-CVE-2026-50012](https://patchblox.com/security/data/fix/linux/debian-cve-2026-50012.md) | Jun 24, 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) | 5.9-0ubuntu0.22.04.7 | [squid 5.9-0ubuntu0.22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-5.9-0ubuntu0.22.04.7.md) | Jun 24, 2026 |
| Linux | squid Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.4 | [squid 6.14-0ubuntu0.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-6.14-0ubuntu0.24.04.4.md) | Jun 24, 2026 |
| Linux | squid Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.4 | [squid 6.14-0ubuntu0.25.10.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-6.14-0ubuntu0.25.10.4.md) | Jun 24, 2026 |
| Linux | squid Ubuntu 26.04.1 LTS (resolute) | 7.2-2ubuntu2.2 | [squid 7.2-2ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-squid-7.2-2ubuntu2.2.md) | Jun 11, 2026 |
| Linux | squid amzn 2023 | 7:6.13-1.amzn2023.0.5 | [ALAS2023-2026-1858](https://patchblox.com/security/data/fix/linux/alas2023-2026-1858.md) | Jun 22, 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) | 5.9-0ubuntu0.22.04.7 | [squid-cgi 5.9-0ubuntu0.22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-cgi-5.9-0ubuntu0.22.04.7.md) | Jun 24, 2026 |
| Linux | squid-cgi Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.4 | [squid-cgi 6.14-0ubuntu0.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-cgi-6.14-0ubuntu0.24.04.4.md) | Jun 24, 2026 |
| Linux | squid-cgi Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.4 | [squid-cgi 6.14-0ubuntu0.25.10.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-cgi-6.14-0ubuntu0.25.10.4.md) | Jun 24, 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) | 5.9-0ubuntu0.22.04.7 | [squid-common 5.9-0ubuntu0.22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-common-5.9-0ubuntu0.22.04.7.md) | Jun 24, 2026 |
| Linux | squid-common Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.4 | [squid-common 6.14-0ubuntu0.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-common-6.14-0ubuntu0.24.04.4.md) | Jun 24, 2026 |
| Linux | squid-common Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.4 | [squid-common 6.14-0ubuntu0.25.10.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-common-6.14-0ubuntu0.25.10.4.md) | Jun 24, 2026 |
| Linux | squid-common Ubuntu 26.04.1 LTS (resolute) | 7.2-2ubuntu2.2 | [squid-common 7.2-2ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-squid-common-7.2-2ubuntu2.2.md) | Jun 11, 2026 |
| Linux | squid-debuginfo amzn 2023 | 7:6.13-1.amzn2023.0.5 | [ALAS2023-2026-1858](https://patchblox.com/security/data/fix/linux/alas2023-2026-1858.md) | Jun 22, 2026 |
| Linux | squid-debugsource amzn 2023 | 7:6.13-1.amzn2023.0.5 | [ALAS2023-2026-1858](https://patchblox.com/security/data/fix/linux/alas2023-2026-1858.md) | Jun 22, 2026 |
| Linux | squid-openssl Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.7 | [squid-openssl 5.9-0ubuntu0.22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-openssl-5.9-0ubuntu0.22.04.7.md) | Jun 24, 2026 |
| Linux | squid-openssl Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.4 | [squid-openssl 6.14-0ubuntu0.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-openssl-6.14-0ubuntu0.24.04.4.md) | Jun 24, 2026 |
| Linux | squid-openssl Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.4 | [squid-openssl 6.14-0ubuntu0.25.10.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-openssl-6.14-0ubuntu0.25.10.4.md) | Jun 24, 2026 |
| Linux | squid-openssl Ubuntu 26.04.1 LTS (resolute) | 7.2-2ubuntu2.2 | [squid-openssl 7.2-2ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-squid-openssl-7.2-2ubuntu2.2.md) | Jun 11, 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) | 5.9-0ubuntu0.22.04.7 | [squid-purge 5.9-0ubuntu0.22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squid-purge-5.9-0ubuntu0.22.04.7.md) | Jun 24, 2026 |
| Linux | squid-purge Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.4 | [squid-purge 6.14-0ubuntu0.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squid-purge-6.14-0ubuntu0.24.04.4.md) | Jun 24, 2026 |
| Linux | squid-purge Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.4 | [squid-purge 6.14-0ubuntu0.25.10.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squid-purge-6.14-0ubuntu0.25.10.4.md) | Jun 24, 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) | 5.9-0ubuntu0.22.04.7 | [squidclient 5.9-0ubuntu0.22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-squidclient-5.9-0ubuntu0.22.04.7.md) | Jun 24, 2026 |
| Linux | squidclient Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.4 | [squidclient 6.14-0ubuntu0.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-squidclient-6.14-0ubuntu0.24.04.4.md) | Jun 24, 2026 |
| Linux | squidclient Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.4 | [squidclient 6.14-0ubuntu0.25.10.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-squidclient-6.14-0ubuntu0.25.10.4.md) | Jun 24, 2026 |

---

Data as of 2026-11-09T01:18:40Z 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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