---
id: CVE-2026-63386
title: js-toml is a TOML parser for JavaScript
summary: >-
  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
  neste…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-674
vendor: sunnyadn
product: js-toml
affected:
  - js-toml < 1.1.3
published: '2026-09-22'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T01:17:01.650'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63386'
references:
  - url: >-
      https://github.com/sunnyadn/js-toml/commit/4e10acf1f99ff3cb443c58b8f0a57664e41e87c6
    label: security-advisories@github.com
  - url: 'https://github.com/sunnyadn/js-toml/releases/tag/v1.1.3'
    label: security-advisories@github.com
  - url: >-
      https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5
    label: security-advisories@github.com
  - url: >-
      https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-26T00:06:28.029634Z'
epss: 0.00507
epssPercentile: 0.40705
ingestedAt: '2026-09-22T20:10:15.087Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.