CVE-2026-49762 Unbounded integer parsing in the Version module enables CPU and memory exhaustion denial of service
Attackers can cause CPU and memory exhaustion denial of service by supplying large version strings to the Elixir Version module.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-49762?
CVE-2026-49762 is a medium-severity denial of service vulnerability in elixir-lang elixir, published on 9 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-400
Which versions are affected by CVE-2026-49762?
How do I fix CVE-2026-49762?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-49762 being exploited?
There is no known exploitation of CVE-2026-49762 in the wild and no public exploit code.
Sources
Also known as AZL-89672, DEBIAN-CVE-2026-49762, EEF-CVE-2026-49762, GHSA-w2h8-8x3g-278p, OESA-2026-2787, UBUNTU-CVE-2026-49762.