CVE-2026-109821
MEDIUMAttack Surface
CVSS Vector Breakdown
Description
Improper Validation of Specified Quantity in Input vulnerability in the Elixir standard library's URI module allows an attacker who supplies a URL to cause a denial of service through CPU exhaustion. URI.parse/1 converts the port component with String.to_integer/1 in split_authority/1 (lib/elixir/lib/uri.ex) without bounding its length, so a port of up to 1,262,592 decimal digits produces a bignum of that size and a longer one raises SystemLimitError. Rendering the parsed URI back to text (URI.to_string/1, inspect/1, logging, error formatting) converts the bignum with :erlang.integer_to_binary/1, which is quadratic on Erlang/OTP 27, 28 and 29.0: a 400,000-digit port renders in about 2.6 seconds and a 1 MB port in about 18 seconds. Ports above 65535 are also accepted. This issue affects elixir: from 0.5.0 before 1.18.6, from 1.19.0-rc.0 before 1.19.7, and from 1.20.0-rc.0 before 1.20.5.
Weakness Classification (2)
Affected Software (12)
| Vendor | Product | Version |
|---|---|---|
| elixir-lang | elixir | 0.5.0 < 1.18.6 |
| elixir-lang | elixir | 1.19.0-rc.0 < 1.19.7 |
| elixir-lang | elixir | 1.20.0-rc.0 < 1.20.5 |
| elixir-lang | elixir | 39801821eef2d06524e5ebf5a0e4b3c380ad23ae < * |
| elixir-lang | elixir | 0.5.0 < 1.18.6 |
| elixir-lang | elixir | 1.19.0-rc.0 < 1.19.7 |
| elixir-lang | elixir | 1.20.0-rc.0 < 1.20.5 |
| elixir-lang | elixir | 39801821eef2d06524e5ebf5a0e4b3c380ad23ae < * |
| elixir-lang | elixir | 0.5.0 < 1.18.6 |
| elixir-lang | elixir | 1.19.0-rc.0 < 1.19.7 |
| elixir-lang | elixir | 1.20.0-rc.0 < 1.20.5 |
| elixir-lang | elixir | 39801821eef2d06524e5ebf5a0e4b3c380ad23ae < * |