Cloudanix VulnDB

GHSA-2x79-gwq3-vxxm

High · 7.5

Uncontrolled resource consumption and loop with unreachable exit condition in facil.io and downstream iodine ruby gem

CVSS

7.5

EPSS

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Published

Apr 14, 2026

CISA due date

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The record

`fio_json_parse` can enter an infinite loop when it encounters a nested JSON value starting with `i` or `I`. The process spins in user space and pegs one CPU core at ~100% instead of returning a parse error. Because `iodine` vendors the same parser code, the issue also affects `iodine` when it parses attacker-controlled JSON. The smallest reproducer found is `[i`. The quoted-value form that originally exposed the issue, `[""i`, reaches the same bug because the parser tolerates missing commas and then treats the trailing `i` as the start of another value.

Affected packages

Ecosystem Package Introduced Fixed

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