{"cve":"CVE-2026-41146","nvd":{"published":"2026-04-22T02:16:02.237","modified":"2026-10-26T22:10:00.163","status":"Deferred","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":null,"cwes":["CWE-400","CWE-835"],"references":["https://github.com/boazsegev/facil.io/commit/5128747363055201d3ecf0e29bf0a961703c9fa0","https://github.com/boazsegev/facil.io/security/advisories/GHSA-2x79-gwq3-vxxm","https://github.com/boazsegev/facil.io/security/advisories/GHSA-2x79-gwq3-vxxm"],"products":[],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-41146","score":0.00294,"percentile":0.21889,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-2x79-gwq3-vxxm","url":"https://osv.dev/vulnerability/GHSA-2x79-gwq3-vxxm","summary":"Uncontrolled resource consumption and loop with unreachable exit condition in facil.io and downstream iodine ruby gem","modified":"2026-06-08T23:30:14.424673010Z","packages":[{"ecosystem":"RubyGems","name":"iodine","purl":"pkg:gem/iodine","ranges":["<=0.7.58"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}