CVE-2026-63386 (GCVE-0-2026-63386)

Vulnerability from cvelistv5 – Published: 2026-09-22 19:00 – Updated: 2026-09-26 00:06
VLAI
Title
js-toml: Uncontrolled recursion in `load()` causes `RangeError` (stack exhaustion) on deeply nested input
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 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.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-26 00:06 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
sunnyadn js-toml Affected: < 1.1.3
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-63386",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-26T00:06:28.029634Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-26T00:06:50.619Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "js-toml",
          "vendor": "sunnyadn",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 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": "2026-09-26T00:06:50.619Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63386",
      "date": "2026-09-25",
      "epss": "0.00507",
      "percentile": "0.40705"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "js-toml",
                "vendor": "sunnyadn",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 1.1.3"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-63386",
        "lastModified": "2026-09-26T01:17:01.650",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "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"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 1.4,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-63386",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-26T00:06:28.029634Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-09-22T19:16:44.050",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/sunnyadn/js-toml/commit/4e10acf1f99ff3cb443c58b8f0a57664e41e87c6"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/sunnyadn/js-toml/releases/tag/v1.1.3"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "url": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-674"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-63386",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-09-26T00:06:28.029634Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-09-26T00:06:46.575Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-3g82-77xr-68x5"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "js-toml",
              "vendor": "sunnyadn",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 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": "2026-09-26T00:06:50.619Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.