CVE-2026-49762Unbounded integer parsing in the Version module enables CPU and memory exhaustion denial of service

Official description

Uncontrolled Resource Consumption vulnerability in the Elixir standard library's Version module allows an attacker who controls a version string to cause a denial of service through CPU and memory exhaustion. The version parser converts numeric version components (major, minor, patch and numeric pre-release/build identifiers) to integers without bounding their length. A single large all-digit component therefore forces a super-linear, non-yielding base-10 to arbitrary-precision integer conversion (String.to_integer/1, i.e. :erlang.binary_to_integer/1) that pins a BEAM scheduler, and a larger component raises an uncaught SystemLimitError that crashes the calling process. A single moderately sized string (around one megabyte) is enough; no authentication is required. This is reachable from the public entry points Version.parse/1, Version.parse!/1, Version.match?/3, Version.compare/2, and Version.parse_requirement/1, which applications routinely call on untrusted input such as HTTP parameters, dependency-manifest fields, and package metadata. This vulnerability is associated with program files lib/version.ex and program routines 'Elixir.Version.Parser':parse_digits/2. This issue affects elixir: from 0.9.3 before 1.20.1.

Affected packages & fixed versions

Affected products (as reported)

References

• GitHub Advisory related, vendor-advisory
• EEF CNA record for CVE-2026-49762 related
• OSV record EEF-CVE-2026-49762 related
• Introducing commit 0576917 in elixir-lang/elixir related
• Fix commit c64417d in elixir-lang/elixir patch
• Fix commit 64e6707 in elixir-lang/elixir patch