CVE-2026-63386

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: MEDIUM
CVSS score: 5.3 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Effective score: 5.3 / 10 MEDIUM source: CNA overview
CWE(s): CWE-674
Reserved: 2026-07-16
Published: 2026-09-22 19:00 UTC
Last updated: 2026-09-22 19:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/63xxx/CVE-2026-63386.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 19:16:44 UTC
NVD last modified: 2026-09-22 19:16:44 UTC
NVD CVSS v3.1: 5.3 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Exploitability subscore: 3.9 / 10
Impact subscore: 1.4 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84801
Assigner: GitHub_M
Published: Sep 22, 2026, 7:00:19 PM
Updated: Sep 22, 2026, 7:00:19 PM
EUVD base score (CVSS 3.1): 5.3 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EUVD-reported EPSS: 0.0000
Vendors: sunnyadn
Products: js-toml (< 1.1.3)

ENISA 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.

EUVD references (3)

Affected products (1)

Vendor	Product	Versions	Platforms
sunnyadn	js-toml	`< 1.1.3` (affected)	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5 x_refsource_CONFIRM
https://github.com/sunnyadn/js-toml/commit/4e10acf1f99ff3cb443c58b8f0a57664e41e87c6 x_refsource_MISC
https://github.com/sunnyadn/js-toml/releases/tag/v1.1.3 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/sunnyadn/js-toml/commit/4e10acf1f99ff3cb443c58b8f0a57664e41e87c6 security-advisories@github.com
https://github.com/sunnyadn/js-toml/releases/tag/v1.1.3 security-advisories@github.com
https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5 security-advisories@github.com

Remediations (10)

July 2026 Critical Patch Update Released | security - Oracle Blogs

web:blogs.oracle.com

For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

2026-09-23 15:45 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-23 15:45 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:45 UTC
About the security content of iOS 26.6 and iPadOS 26.6

web:support.apple.com

This document describes the security content of iOS 26.6 and iPadOS 26.6.

2026-09-23 15:45 UTC
Patch Roll-up for CPR9 SRx - support.rockwellautomation.com

web:support.rockwellautomation.com

The roll-up uses specific check files to confirm which product is installed. The roll-up will only install patch files provided these files already exist on the target computer, unless a new binary file is being introduced as part of a patch . Patch Install Follow the link to download and extract the latest patch roll-up.

2026-09-23 15:45 UTC
SAP Security Patch Day - June 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 9th of June 2026 , SAP security patch day saw the release of 15 new security notes.

2026-09-23 15:45 UTC
SAP Security Patch Day - May 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 12 th of May 2026 , SAP security patch day saw the release of 15 new security notes.

2026-09-23 15:45 UTC
August 2026 CVE Advisory Notification - Security

web:support.servicenow.com

Due to additional analysis provided by the security researcher who discovered CVE - 2026 -6876, we have upgraded the severity rating of CVE - 2026 -6876 from High to Critical. This change affects only the severity

2026-09-23 15:45 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:45 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:45 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-63386.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "js-toml",
          "vendor": "sunnyadn",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.1.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-674",
              "description": "CWE-674: Uncontrolled Recursion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T19:00:19.734Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5"
        },
        {
          "name": "https://github.com/sunnyadn/js-toml/commit/4e10acf1f99ff3cb443c58b8f0a57664e41e87c6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sunnyadn/js-toml/commit/4e10acf1f99ff3cb443c58b8f0a57664e41e87c6"
        },
        {
          "name": "https://github.com/sunnyadn/js-toml/releases/tag/v1.1.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sunnyadn/js-toml/releases/tag/v1.1.3"
        }
      ],
      "source": {
        "advisory": "GHSA-3g82-77xr-68x5",
        "discovery": "UNKNOWN"
      },
      "title": "js-toml: Uncontrolled recursion in `load()` causes `RangeError` (stack exhaustion) on deeply nested input"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63386",
    "datePublished": "2026-09-22T19:00:19.734Z",
    "dateReserved": "2026-07-16T17:39:30.171Z",
    "dateUpdated": "2026-09-22T19:00:19.734Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}