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CVE-2026-63386— js-toml: Uncontrolled recursion in `load()` causes `RangeError` (stack exhaustion) on deeply nested input

Quick assessment

Affected
sunnyadn js-toml
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 lon

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
sunnyadn js-toml < 1.1.3 affected
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I. Basic Information for CVE-2026-63386

Vulnerability Information

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Vulnerability Title
js-toml: Uncontrolled recursion in `load()` causes `RangeError` (stack exhaustion) on deeply nested input
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sunnyadn js-toml < 1.1.3 -

II. Public POCs for CVE-2026-63386

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III. Intelligence Information for CVE-2026-63386

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Other References for CVE-2026-63386 (3)

IV. Related Vulnerabilities

Same product: js-toml
Same vendor: sunnyadn
Same weakness: CWE-674

V. Comments for CVE-2026-63386

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