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CVE PROGRAM SOURCE RECORD6.9 Medium

CVE-2026-115274

Unbounded integer parsing in JSON.decode/1 enables CPU and memory exhaustion denial of service in Elixir

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Status
Published
Published
Updated
Assigning organization
EEF

Description

Improper Validation of Specified Quantity in Input vulnerability in the Elixir standard library's JSON module allows an unauthenticated attacker who supplies a JSON document to cause a denial of service through CPU and memory exhaustion. JSON.decode/1 and JSON.decode!/1 convert each integer literal with erlang:binary_to_integer/1 and do not bound its length. A literal of one million digits decodes successfully but costs 100 to 300 times as much CPU as a string of the same length, so one request body of a few megabytes holds a scheduler for about a second. A literal of more than about 1.29 million digits raises SystemLimitError. Applications generated by phx.new decode request bodies with JSON in Plug.Parsers, before routing and authentication. This issue affects elixir: from 1.18.0-rc.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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

elixir-lang elixir

Default version status: unaffected

  • 1.18.0-rc.0 to < 1.18.6affected
  • 1.19.0-rc.0 to < 1.19.7affected
  • 1.20.0-rc.0 to < 1.20.5affected
pkg:otp/elixir?repository_url=https:%2F%2Fgithub.com%2Felixir-lang%2Felixir&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Felixir-lang%2Felixir.git

elixir-lang elixir

Default version status: unaffected

  • 793c1147210388587defb649f25f293ffbfa6b1b to < *affected
pkg:github/elixir-lang/elixir

References