sunnyadn js-toml up to 1.1.2 Recursive Parser src/load/parser.ts load denial of service

Summaryinfo

A vulnerability categorized as problematic has been discovered in sunnyadn js-toml up to 1.1.2. The impacted element is the function Load of the file src/load/parser.ts of the component Recursive Parser. Such manipulation leads to denial of service. This vulnerability is listed as CVE-2026-63386. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in sunnyadn js-toml up to 1.1.2 and classified as problematic. Affected by this issue is the function load of the file src/load/parser.ts of the component Recursive Parser. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-63386 since 07/16/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 1.1.3 eliminates this vulnerability.

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Productinfo

Vendor

• sunnyadn

Name

• js-toml

Version

• 1.1.0
• 1.1.1
• 1.1.2

Website

• Product: https://github.com/sunnyadn/js-toml/

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