CVE-2026-115274
Improper Validation of Specified Quantity in Input vulnerability in the Elixir standard library's JSON module allows an unauthenticated attacker who supplies a…
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Elixir-Lang | Elixir | from 1.18.0-rc.0 before 1.18.6 from 1.20.0-rc.0 before 1.20.5 from 1.19.0-rc.0 before 1.19.7 from 793c1147210388587defb649f25f293ffbfa6b1b before * |
Weakness classification
References
- NVD record
- CVE.org record
- https://cna.erlef.org/cves/CVE-2026-115274.html
- https://github.com/elixir-lang/elixir/commit/7154e8781da9fd016a973ea01776a011c8b5726a
- https://github.com/elixir-lang/elixir/commit/793c1147210388587defb649f25f293ffbfa6b1b
- https://github.com/elixir-lang/elixir/commit/c81f12265919c34a0d5134f1905a4eb4edaea1c2
- https://github.com/elixir-lang/elixir/commit/cd158efacdc10b30232864251747dff9b8387dfe
- https://github.com/elixir-lang/elixir/commit/ee5cc23f8928aa5a0f25bb7f28e42ecfc7b7d396
- https://github.com/elixir-lang/elixir/security/advisories/GHSA-rp5q-xqhq-926h
- https://osv.dev/vulnerability/EEF-CVE-2026-115274