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Elixir & Phoenix

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The Wire · Showcase

ELIXIR PATCHES INTEGER PARSING VULNERABILITY

By RepoJournal · Filed · 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

References

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

FAQ

What changed 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.
What should Elixir & Phoenix teams do about it?
Upgrade Elixir to 1.20.1 before next deploy if parsing version strings from user input • Review escript and archive usage for untrusted sources • Enable debug annotations in Phoenix LiveView module config if not already set
Which Elixir & Phoenix repositories shipped on June 10, 2026?
elixir-lang/elixir, phoenixframework/phoenix_live_view

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