# CVE-2026-94055: exim4: Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.

CVE-2026-94055 is fixed in 17 products on 1 platform, first by exim4 4.99.1-1ubuntu1.5, released September 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-94055
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 19, 2026

## Description

Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | exim Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-clamav Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-debuginfo Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-debugsource Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-greylist Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-mon Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-mon-debuginfo Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-mysql Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-mysql-debuginfo Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-pgsql Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim-pgsql-debuginfo Fedora 43 | 4.100.1-1.fc43 | [FEDORA-2026-D202B74C6A](https://patchblox.com/security/data/fix/linux/fedora-2026-d202b74c6a.md) | Oct 6, 2026 |
| Linux | exim4 Debian 14 | 4.100.1-1 | [DEBIAN-CVE-2026-94055](https://patchblox.com/security/data/fix/linux/debian-cve-2026-94055.md) | Sep 25, 2026 |
| Linux | exim4 Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.5 | [exim4 4.99.1-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-4.99.1-1ubuntu1.5.md) | Sep 19, 2026 |
| Linux | exim4-base Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.5 | [exim4-base 4.99.1-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-base-4.99.1-1ubuntu1.5.md) | Sep 19, 2026 |
| Linux | exim4-config Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.5 | [exim4-config 4.99.1-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-config-4.99.1-1ubuntu1.5.md) | Sep 19, 2026 |
| Linux | exim4-daemon-heavy Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.5 | [exim4-daemon-heavy 4.99.1-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-daemon-heavy-4.99.1-1ubuntu1.5.md) | Sep 19, 2026 |
| Linux | exim4-daemon-light Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.5 | [exim4-daemon-light 4.99.1-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-exim4-daemon-light-4.99.1-1ubuntu1.5.md) | Sep 19, 2026 |
| Linux | eximon4 Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.5 | [eximon4 4.99.1-1ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-eximon4-4.99.1-1ubuntu1.5.md) | Sep 19, 2026 |

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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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