End of life, severity medium

Go 1.25 reached end of life on 2026-08-19

Published October 31, 2026

Go 1.25 no longer gets security fixes.

Deadline: August 19, 2026

What's affected

• go runtime>=1.25 <1.26

What to do

1. Upgrade Go to a supported version (latest 1.25.x is 1.25.14; move to a newer cycle).

Check whether you were affected

Pharon tells teams automatically when this affects something they run. To check a machine, run this in Claude Code with the Pharon plugin, in the repository that uses it:

/pharon:check-incident eol-go-1-25

References

• https://endoflife.date/go

Notice eol-go-1-25, signed with key feed-prod-2026-10 (Ed25519). The Pharon CLI verifies the signature before using a notice.