What were the notable Elixir & Phoenix updates?

Limit version numbers to 14 bytes, Clarify security considerations and disclaimers to archive/escript install, and v1.20.1.

Elixir & Phoenix

Elixir, Phoenix, LiveView, and Ecto - the BEAM web stack

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The Wire · Showcase

ELIXIR PATCHES INTEGER PARSING VULNERABILITY

By RepoJournal · Filed 06:05 UTC on June 10, 2026 · About Elixir & Phoenix

Elixir 1.20.1 shipped overnight with a critical fix for version number parsing that could allow attackers to exploit untrusted input.

The Elixir team capped version number components to 14 bytes, blocking a parsing DoS vector when handling versions from external sources [1]. This fixes CVE-2026-49762 directly. The same release tightens security guidance around escript install and archive extraction [2], making explicit what developers should assume about trust boundaries. Both changes reflect a hardening posture on input validation that should influence how you handle untrusted data upstream. On the lighter side, v1.20.1 also caps Calendar.strftime width to 1024 characters and fixes a Code.require_file leak [3]. Phoenix LiveView added clarification around module config for debug annotations [4], a small quality-of-life improvement for development workflows.

Action items

→ Upgrade Elixir to 1.20.1 before next deploy if parsing version strings from user input elixir-lang/elixir [immediate]
→ Review escript and archive usage for untrusted sources elixir-lang/elixir [plan]
→ Enable debug annotations in Phoenix LiveView module config if not already set phoenixframework/phoenix_live_view [monitor]

References

[1] Limit version numbers to 14 bytes elixir-lang/elixir
[2] Clarify security considerations and disclaimers to archive/escript install elixir-lang/elixir
[3] v1.20.1 ↗ elixir-lang/elixir
[4] add note about module config for debug annotations phoenixframework/phoenix_live_view

Quick answers

What shipped in Elixir & Phoenix on June 10, 2026?: Elixir 1.20.1 shipped overnight with a critical fix for version number parsing that could allow attackers to exploit untrusted input. In total, 7 commits, 1 pull requests, and 1 releases landed.
What were the notable Elixir & Phoenix updates?: Limit version numbers to 14 bytes, Clarify security considerations and disclaimers to archive/escript install, and v1.20.1.

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