# CVE-2026-66141: exim4: Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandled.

CVE-2026-66141 is fixed in 6 products on 1 platform, first by exim4 4.99.1-1ubuntu1.4, released July 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-66141
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 23, 2026

## Description

Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandled.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | exim4 Debian 13.5 (trixie) | 4.98.2-1+deb13u4 | [DEBIAN-CVE-2026-66141](https://patchblox.com/security/data/fix/linux/debian-cve-2026-66141.md) | Jul 25, 2026 |
| Linux | exim4 Debian 14 | 4.99.4-2 | [DEBIAN-CVE-2026-66141](https://patchblox.com/security/data/fix/linux/debian-cve-2026-66141.md) | Jul 25, 2026 |
| Linux | exim4 Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.11 | [exim4 4.95-4ubuntu2.11](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-exim4-4.95-4ubuntu2.11.md) | Jul 31, 2026 |
| Linux | exim4 Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.7 | [exim4 4.97-4ubuntu4.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-exim4-4.97-4ubuntu4.7.md) | Jul 31, 2026 |
| Linux | exim4 Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.4 | [exim4 4.99.1-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-4.99.1-1ubuntu1.4.md) | Jul 23, 2026 |
| Linux | exim4-base Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.11 | [exim4-base 4.95-4ubuntu2.11](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-exim4-base-4.95-4ubuntu2.11.md) | Jul 31, 2026 |
| Linux | exim4-base Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.7 | [exim4-base 4.97-4ubuntu4.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-exim4-base-4.97-4ubuntu4.7.md) | Jul 31, 2026 |
| Linux | exim4-base Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.4 | [exim4-base 4.99.1-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-base-4.99.1-1ubuntu1.4.md) | Jul 23, 2026 |
| Linux | exim4-config Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.11 | [exim4-config 4.95-4ubuntu2.11](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-exim4-config-4.95-4ubuntu2.11.md) | Jul 31, 2026 |
| Linux | exim4-config Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.7 | [exim4-config 4.97-4ubuntu4.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-exim4-config-4.97-4ubuntu4.7.md) | Jul 31, 2026 |
| Linux | exim4-config Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.4 | [exim4-config 4.99.1-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-config-4.99.1-1ubuntu1.4.md) | Jul 23, 2026 |
| Linux | exim4-daemon-heavy Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.11 | [exim4-daemon-heavy 4.95-4ubuntu2.11](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-exim4-daemon-heavy-4.95-4ubuntu2.11.md) | Jul 31, 2026 |
| Linux | exim4-daemon-heavy Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.7 | [exim4-daemon-heavy 4.97-4ubuntu4.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-exim4-daemon-heavy-4.97-4ubuntu4.7.md) | Jul 31, 2026 |
| Linux | exim4-daemon-heavy Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.4 | [exim4-daemon-heavy 4.99.1-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-daemon-heavy-4.99.1-1ubuntu1.4.md) | Jul 23, 2026 |
| Linux | exim4-daemon-light Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.11 | [exim4-daemon-light 4.95-4ubuntu2.11](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-exim4-daemon-light-4.95-4ubuntu2.11.md) | Jul 31, 2026 |
| Linux | exim4-daemon-light Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.7 | [exim4-daemon-light 4.97-4ubuntu4.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-exim4-daemon-light-4.97-4ubuntu4.7.md) | Jul 31, 2026 |
| Linux | exim4-daemon-light Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.4 | [exim4-daemon-light 4.99.1-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-daemon-light-4.99.1-1ubuntu1.4.md) | Jul 23, 2026 |
| Linux | eximon4 Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.11 | [eximon4 4.95-4ubuntu2.11](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-eximon4-4.95-4ubuntu2.11.md) | Jul 31, 2026 |
| Linux | eximon4 Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.7 | [eximon4 4.97-4ubuntu4.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-eximon4-4.97-4ubuntu4.7.md) | Jul 31, 2026 |
| Linux | eximon4 Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.4 | [eximon4 4.99.1-1ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-eximon4-4.99.1-1ubuntu1.4.md) | Jul 23, 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.