Vulnerability/
https://seclists.org/oss-sec/2026/q3/838

https://seclists.org/oss-sec/2026/q3/838: Exim Security lease 4.100.1

Q: Which Exim versions should be prioritized for update?

Exim versions 4.83 through 4.100, inclusive, are affected by GCVE-25-2026-09-50-1. Upgrade to Exim 4.100.1, which is identified as the corrected release.

Q: Does Exim 4.100.1 address more than one security issue?

Yes. The release announcement states that Exim 4.100.1 includes fixes for four security issues: GCVE-25-2026-09-50-1, GCVE-25-2026-09-51-1, GCVE-25-2026-09-55-1, and GCVE-25-2026-09-56-1.

Published Sep 19, 2026

Updated

Affected Software

3 affected components

Exim Exim>=4.83<=4.100

Exim Exim>=4.98<=4.100

Exim Exim<=4.100

Frequently Asked Questions

Which Exim versions should be prioritized for update?

Exim versions 4.83 through 4.100, inclusive, are affected by GCVE-25-2026-09-50-1. Upgrade to Exim 4.100.1, which is identified as the corrected release.

Does Exim 4.100.1 address more than one security issue?

Yes. The release announcement states that Exim 4.100.1 includes fixes for four security issues: GCVE-25-2026-09-50-1, GCVE-25-2026-09-51-1, GCVE-25-2026-09-55-1, and GCVE-25-2026-09-56-1.

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