Exim vulnerabilities: known CVEs & security history
Exim · Mail server · 7 tracked CVEs · 0 actively exploited · updated September 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Exim release lines — 7 in total. A CVE here doesn't mean your version is affected — check Exim's current status and the safe version to run.
Known Exim CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2026-66140 | high | 8.4 | 0% | 2026 |
| CVE-2026-94056 | high | 7.5 | 0% | 2026 |
| CVE-2026-66141 | high | 7.4 | 0% | 2026 |
| CVE-2026-94054 | high | 7 | 0% | 2026 |
| CVE-2026-48840 | medium | 5.3 | 0% | 2026 |
| CVE-2026-94057 | medium | 4 | 0% | 2026 |
| CVE-2026-94055 | low | 3.7 | 0% | 2026 |
Is my Exim version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Exim version → · Monitor Exim for new CVEs →
Exim vulnerabilities — frequently asked
How many known vulnerabilities does Exim have?
IsItPatched tracks 7 CVEs for Exim. 0 are critical-severity and 4 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Exim have any actively-exploited vulnerabilities?
None of Exim's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe Exim vulnerability?
Among tracked issues, CVE-2026-66140 (HIGH, CVSS 8.4) ranks highest — a CWE-24 weakness.
Is Exim safe to use?
It depends on the version. The latest supported Exim release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Exim security status · Exim end-of-life · actively-exploited CVEs. Always verify against Exim's advisories — see our disclaimer.