# CVE-2026-41146

> Vulnerability.

## Description

facil.io is a C micro-framework for web applications. Prior to commit 5128747363055201d3ecf0e29bf0a961703c9fa0, `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 I 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. Commit 5128747363055201d3ecf0e29bf0a961703c9fa0 fixes the issue.

## Key facts

- **CVE ID:** CVE-2026-41146
- **Published:** 2026-04-22
- **CWE codes:** CWE-400, CWE-835

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41146

## Citation

> AI Analytics. CVE-2026-41146. Retrieved 2026-07-23 from https://api.ai-analytics.org/cve/CVE-2026-41146. Derived from NIST NVD. Licensed CC0.

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