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.
CVSS
No CVSS.
References
Configurations
No configuration.
History
30 Oct 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/elixir-lang/elixir/security/advisories/GHSA-327h-97cv-59xg - |
30 Oct 2026, 09:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-30 09:17
Updated : 2026-10-30 19:39
NVD link : CVE-2026-109821
Mitre link : CVE-2026-109821
CVE.ORG link : CVE-2026-109821
JSON object : View
Products Affected
No product.