exim4: Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsin...
CVE-2026-45185 is fixed in 6 products on 1 platform, first by exim4 4.99.1-1ubuntu1.2, released May 12, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| exim4 · Debian 12.15 (bookworm) | 4.96-15+deb12u9 | DEBIAN-CVE-2026-45185 | May 15, 2026 |
| exim4 · Debian 13.5 (trixie) | 4.98.2-1+deb13u2 | DEBIAN-CVE-2026-45185 | May 15, 2026 |
| exim4 · Debian 14 | 4.99.2-2 | DEBIAN-CVE-2026-45185 | May 15, 2026 |
| exim4 · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.12+esm1 | exim4 4.93-13ubuntu1.12+esm1 | Jun 24, 2026 |
| exim4 · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.8 | exim4 4.95-4ubuntu2.8 | May 27, 2026 |
| exim4 · Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.5 | exim4 4.97-4ubuntu4.5 | May 27, 2026 |
| exim4 · Ubuntu 25.10 (questing) | 4.98.2-1ubuntu2.2 | exim4 4.98.2-1ubuntu2.2 | May 27, 2026 |
| exim4 · Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.2 | exim4 4.99.1-1ubuntu1.2 | May 12, 2026 |
| exim4-base · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.12+esm1 | exim4-base 4.93-13ubuntu1.12+esm1 | Jun 24, 2026 |
| exim4-base · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.8 | exim4-base 4.95-4ubuntu2.8 | May 27, 2026 |
| exim4-base · Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.5 | exim4-base 4.97-4ubuntu4.5 | May 27, 2026 |
| exim4-base · Ubuntu 25.10 (questing) | 4.98.2-1ubuntu2.2 | exim4-base 4.98.2-1ubuntu2.2 | May 27, 2026 |
| exim4-base · Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.2 | exim4-base 4.99.1-1ubuntu1.2 | May 12, 2026 |
| exim4-config · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.12+esm1 | exim4-config 4.93-13ubuntu1.12+esm1 | Jun 24, 2026 |
| exim4-config · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.8 | exim4-config 4.95-4ubuntu2.8 | May 27, 2026 |
| exim4-config · Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.5 | exim4-config 4.97-4ubuntu4.5 | May 27, 2026 |
| exim4-config · Ubuntu 25.10 (questing) | 4.98.2-1ubuntu2.2 | exim4-config 4.98.2-1ubuntu2.2 | May 27, 2026 |
| exim4-config · Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.2 | exim4-config 4.99.1-1ubuntu1.2 | May 12, 2026 |
| exim4-daemon-heavy · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.12+esm1 | exim4-daemon-heavy 4.93-13ubuntu1.12+esm1 | Jun 24, 2026 |
| exim4-daemon-heavy · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.8 | exim4-daemon-heavy 4.95-4ubuntu2.8 | May 27, 2026 |
| exim4-daemon-heavy · Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.5 | exim4-daemon-heavy 4.97-4ubuntu4.5 | May 27, 2026 |
| exim4-daemon-heavy · Ubuntu 25.10 (questing) | 4.98.2-1ubuntu2.2 | exim4-daemon-heavy 4.98.2-1ubuntu2.2 | May 27, 2026 |
| exim4-daemon-heavy · Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.2 | exim4-daemon-heavy 4.99.1-1ubuntu1.2 | May 12, 2026 |
| exim4-daemon-light · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.12+esm1 | exim4-daemon-light 4.93-13ubuntu1.12+esm1 | Jun 24, 2026 |
| exim4-daemon-light · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.8 | exim4-daemon-light 4.95-4ubuntu2.8 | May 27, 2026 |
| exim4-daemon-light · Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.5 | exim4-daemon-light 4.97-4ubuntu4.5 | May 27, 2026 |
| exim4-daemon-light · Ubuntu 25.10 (questing) | 4.98.2-1ubuntu2.2 | exim4-daemon-light 4.98.2-1ubuntu2.2 | May 27, 2026 |
| exim4-daemon-light · Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.2 | exim4-daemon-light 4.99.1-1ubuntu1.2 | May 12, 2026 |
| eximon4 · Ubuntu 20.04 LTS (focal) | 4.93-13ubuntu1.12+esm1 | eximon4 4.93-13ubuntu1.12+esm1 | Jun 24, 2026 |
| eximon4 · Ubuntu 22.04.1 LTS (jammy) | 4.95-4ubuntu2.8 | eximon4 4.95-4ubuntu2.8 | May 27, 2026 |
| eximon4 · Ubuntu 24.04.5 LTS (noble) | 4.97-4ubuntu4.5 | eximon4 4.97-4ubuntu4.5 | May 27, 2026 |
| eximon4 · Ubuntu 25.10 (questing) | 4.98.2-1ubuntu2.2 | eximon4 4.98.2-1ubuntu2.2 | May 27, 2026 |
| eximon4 · Ubuntu 26.04.1 LTS (resolute) | 4.99.1-1ubuntu1.2 | eximon4 4.99.1-1ubuntu1.2 | May 12, 2026 |
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