https://seclists.org/oss-sec/2026/q3/526: Fwd: [pfx] Postfix stable lease 3.11.6 and legacy leases 3.10.13, 3.9.14, 3.8.20, 3.7.22, 3.6.20, 3.5.27

Q: Are installations on out-of-support Postfix branches covered by this release cycle?

Updates are stated to be available for the out-of-support 3.5 through 3.7 branches, in addition to supported 3.8 through 3.11 releases. Operators on those older branches should note that these releases do not include the patches issued for large SMTP inputs in June 2026.

Q: Is a corresponding unstable release available?

Yes. The fixes are also included in postfix-3.12-20260809.

Published Aug 20, 2026

Updated

Affected Software

7 affected components

Postfix Postfix>3.5.27<=3.6.20

Postfix Postfix=3.6.20

Postfix Postfix=3.7.22

Postfix Postfix=3.8.20

Postfix Postfix=3.9.14

Postfix Postfix=3.10.13

Postfix Postfix=3.11.6

Frequently Asked Questions

Are installations on out-of-support Postfix branches covered by this release cycle?

Updates are stated to be available for the out-of-support 3.5 through 3.7 branches, in addition to supported 3.8 through 3.11 releases. Operators on those older branches should note that these releases do not include the patches issued for large SMTP inputs in June 2026.

Is a corresponding unstable release available?

Yes. The fixes are also included in postfix-3.12-20260809.

https://seclists.org/oss-sec/2026/q3/526: Fwd: [pfx] Postfix stable lease 3.11.6 and legacy leases 3.10.13, 3.9.14, 3.8.20, 3.7.22, 3.6.20, 3.5.27

Affected Software

Frequently Asked Questions

Are installations on out-of-support Postfix branches covered by this release cycle?

Is a corresponding unstable release available?

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