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CVE-2026-41146

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 fo
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a6cc133366e60298443ae8f79931053f5e854bf9cd7a5513ac43eeb29d75d6d1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"facil.io","vendor":"boazsegev","versions":[{"status":"affected","version":"< 5128747363055201d3ecf0e29bf0a961703c9fa0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/affected/0

{"product":"iodine","vendor":"boazsegev","versions":[{"status":"affected","version":"< 0.7.59"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/affected/1
cwe · 2 assertions

{"cweId":"CWE-835","description":"CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

2 source assertions
{"product":"facil.io","vendor":"boazsegev","versions":[{"status":"affected","version":"< 5128747363055201d3ecf0e29bf0a961703c9fa0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/affected/0
{"product":"iodine","vendor":"boazsegev","versions":[{"status":"affected","version":"< 0.7.59"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-835","description":"CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/boazsegev/facil.io/commit/5128747363055201d3ecf0e29bf0a961703c9fa0","tags":["x_refsource_MISC"],"url":"https://github.com/boazsegev/facil.io/commit/5128747363055201d3ecf0e29bf0a961703c9fa0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/boazsegev/facil.io/security/advisories/GHSA-2x79-gwq3-vxxm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/adp/0/references/0
{"name":"https://github.com/boazsegev/facil.io/security/advisories/GHSA-2x79-gwq3-vxxm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/boazsegev/facil.io/security/advisories/GHSA-2x79-gwq3-vxxm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:df16811d441275ac7464fbada3c1e98d712c2e0d8155c75837e4946570188399 · sha256:37587438275e47f7… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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