Vulnerability 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.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-115274.html
- https://github.com/elixir-lang/elixir/commit/7154e8781da9fd016a973ea01776a011c8b
- https://github.com/elixir-lang/elixir/commit/793c1147210388587defb649f25f293ffbf
- https://github.com/elixir-lang/elixir/commit/c81f12265919c34a0d5134f1905a4eb4eda
- https://github.com/elixir-lang/elixir/commit/cd158efacdc10b30232864251747dff9b83
- https://github.com/elixir-lang/elixir/commit/ee5cc23f8928aa5a0f25bb7f28e42ecfc7b
- https://github.com/elixir-lang/elixir/security/advisories/GHSA-rp5q-xqhq-926h
- https://osv.dev/vulnerability/EEF-CVE-2026-115274
- https://github.com/elixir-lang/elixir/security/advisories/GHSA-rp5q-xqhq-926h
FAQ
What is CVE-2026-115274?
CVE-2026-115274 is a documented vulnerability. 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 servi...
How severe is CVE-2026-115274?
CVSS scoring is not yet available for CVE-2026-115274. Check NVD for updates.
Is there a patch for CVE-2026-115274?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.