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Vulnerabilities

Vulnerability · CVE-2026-41146

facil.io is a C micro-framework for web applications.

Published Apr 22, 2026 · catalog updated Jun 17, 2026 · facil.io is a C

Check if you run it

No confirmed exploitation is on record for CVE-2026-41146. EPSS is 0.43%. Act only if a listed version of facil.io is a C is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (facil.io is a C).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Advisory link
Affected products
See sources for product scope

facil.io is a C micro-framework for web applications. Prior to commit 5128747363055201d3ecf0e29bf0a961703c9fa0, can enter an infinite loop when it encounters a nested JSON value starting with or . The process spins in user space and pegs one CPU core at ~100% instead of returning a parse error. Because vendors the same parser code, the issue also affects when it parses attacker-controlled JSON. The smallest reproducer I found is . The quoted-value form that originally exposed the issue, , reaches the same bug because the parser tolerates missing commas and then treats the trailing as the start of another value. Commit 5128747363055201d3ecf0e29bf0a961703c9fa0 fixes the issue.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-41146

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-41146. EPSS is 0.43%. Act only if a listed version of facil.io is a C is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-400: Uncontrolled Resource Consumption; CWE-835: Infinite Loop. EPSS 0.43%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 22, 2026 · NIST NVD

    Detected

    facil.io is a C micro-framework for web applications. Prior to commit 5128747363055201d3ecf0e29bf0a961703c9fa0, can enter an infinite loop when it encounters a nested JSON value starting with or . The process spins in user space and pegs one CPU core at ~100% instead of returning a parse error. Because vendors the same parser code, the issue also affects when it parses attacker-controlled JSON. Th

  2. Jun 17, 2026 · NIST NVD

    Updated

    facil.io is a C micro-framework for web applications. Prior to commit 5128747363055201d3ecf0e29bf0a961703c9fa0, can enter an infinite loop when it encounters a nested JSON value starting with or . The process spins in user space and pegs one CPU core at ~100% instead of returning a parse error. Because vendors the same parser code, the issue also affects when it parses attacker-controlled JSON. Th

Sources

  • CVE.orgVulnerability recordCVE-2026-41146

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-41146

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-41146

    facil.io is a C micro-framework for web applications. Prior to commit 5128747363055201d3ecf0e29bf0a961703c9fa0, can enter an infinite loop when it encounters a nested JSON value starting with or . The process spins in user space and pegs one CPU core at ~1

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.