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wire 2026-06-10
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ELIXIR PATCHES INTEGER PARSING VULNERABILITY

By RepoJournal · Filed · About Elixir & Phoenix · Composed from the cited sources · methodology

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.

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.