{"id":"CVE-2026-109821","published":"2026-10-30T09:17:12.143","lastModified":"2026-10-30T19:39:14.897","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.\n\nURI.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.\n\nThis 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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-400","CWE-1284"],"vendors":[],"products":[],"references":[{"url":"https://cna.erlef.org/cves/CVE-2026-109821.html","tags":[]},{"url":"https://github.com/elixir-lang/elixir/commit/07d9abc3f3ac4c8d2ba8384bd102b6d6205b08b7","tags":[]},{"url":"https://github.com/elixir-lang/elixir/commit/39801821eef2d06524e5ebf5a0e4b3c380ad23ae","tags":[]},{"url":"https://github.com/elixir-lang/elixir/commit/9a39d64a4473d02681c486bc70681c972479d32b","tags":[]},{"url":"https://github.com/elixir-lang/elixir/commit/b70f33a591b6ab8eb0fa4a7e00bac1c2ed4e0d58","tags":[]},{"url":"https://github.com/elixir-lang/elixir/commit/d879b39d778fec2f475689573d5672720c4f2a21","tags":[]},{"url":"https://github.com/elixir-lang/elixir/security/advisories/GHSA-327h-97cv-59xg","tags":[]},{"url":"https://github.com/erlang/otp/security/advisories/GHSA-8qw4-2chm-mvj2","tags":[]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-109821","tags":[]},{"url":"https://github.com/elixir-lang/elixir/security/advisories/GHSA-327h-97cv-59xg","tags":[]}],"exploitRefs":[{"url":"https://github.com/elixir-lang/elixir/commit/07d9abc3f3ac4c8d2ba8384bd102b6d6205b08b7","tags":[]},{"url":"https://github.com/elixir-lang/elixir/commit/39801821eef2d06524e5ebf5a0e4b3c380ad23ae","tags":[]},{"url":"https://github.com/elixir-lang/elixir/commit/9a39d64a4473d02681c486bc70681c972479d32b","tags":[]},{"url":"https://github.com/elixir-lang/elixir/commit/b70f33a591b6ab8eb0fa4a7e00bac1c2ed4e0d58","tags":[]},{"url":"https://github.com/elixir-lang/elixir/commit/d879b39d778fec2f475689573d5672720c4f2a21","tags":[]},{"url":"https://github.com/elixir-lang/elixir/security/advisories/GHSA-327h-97cv-59xg","tags":[]},{"url":"https://github.com/erlang/otp/security/advisories/GHSA-8qw4-2chm-mvj2","tags":[]},{"url":"https://github.com/elixir-lang/elixir/security/advisories/GHSA-327h-97cv-59xg","tags":[]}],"hasPoc":true,"ai":null}