Vulnerability Description
js-toml is a TOML parser for JavaScript. Prior to 1.1.3, load() does not bound nesting or dotted-key depth in the recursive parser at src/load/parser.ts or the interpreter at src/load/interpreter.ts, so deeply nested arrays, deeply nested inline tables, or long dotted keys can exhaust the V8 call stack and throw a raw RangeError instead of the documented SyntaxParseError. Applications that parse attacker-controlled TOML and handle only SyntaxParseError can rethrow the unexpected exception, which can terminate a worker or process and cause denial of service. The exception is synchronous and catchable by consumers that handle all exceptions, and the issue does not affect confidentiality or integrity. This issue is fixed in version 1.1.3.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/sunnyadn/js-toml/commit/4e10acf1f99ff3cb443c58b8f0a57664e41e8
- https://github.com/sunnyadn/js-toml/releases/tag/v1.1.3
- https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5
- https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5
FAQ
What is CVE-2026-63386?
CVE-2026-63386 is a vulnerability with a CVSS score of 5.3 (MEDIUM). js-toml is a TOML parser for JavaScript. Prior to 1.1.3, load() does not bound nesting or dotted-key depth in the recursive parser at src/load/parser.ts or the interpreter at src/load/interpreter.ts, ...
How severe is CVE-2026-63386?
CVE-2026-63386 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63386?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.