CVE-2026-41146

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Source
https://cve.org/CVERecord?id=CVE-2026-41146
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41146.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-41146
Aliases
Published
2026-04-22T01:07:28.660Z
Modified
2026-07-08T08:05:12.037894883Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
facil.io and downstream iodine ruby gem vulnerable to uncontrolled resource consumption and loop with unreachable exit condition
Details

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.

Database specific 
{
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "fixed": "5128747363055201d3ecf0e29bf0a961703c9fa0"
                },
                {
                    "fixed": "0.7.59"
                }
            ]
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41146.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-400",
        "CWE-835"
    ]
}
References

Affected packages

Git / github.com/boazsegev/facil.io

Affected ranges

Type
GIT
Repo
https://github.com/boazsegev/facil.io
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
5128747363055201d3ecf0e29bf0a961703c9fa0
Database specific 
{
    "source": "REFERENCES"
}

Affected versions

0.*
0.3.1
0.3.2
0.4.1
0.4.2
0.4.3
0.4.4
0.5.0
0.5.1
0.5.2
0.5.4
0.5.5
0.5.6
0.5.7
0.5.8
0.6.0
0.6.0.beta
0.6.0.beta.2
0.6.0.beta.3
0.6.0.beta.4
0.6.0.beta.5
0.6.0.beta.6
0.6.0.beta.7
0.6.0.beta.8
0.6.0.dev
0.6.1
0.6.2
0.6.3
0.6.4
0.7.0
0.7.0.beta1
0.7.0.beta2
0.7.0.beta3
0.7.0.beta4
0.7.0.beta5
0.7.0.beta6
0.7.0.beta7
0.7.0.beta8
0.7.2
0.7.3
0.7.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41146.json"