CVE-2026-107353 (GCVE-0-2026-107353)

Vulnerability from cvelistv5 – Published: 2026-10-07 19:35 – Updated: 2026-10-07 20:37
VLAI
Title
traverse: set() can write to built-in prototypes via an untrusted path
Summary
traverse (npm) versions 0.3.6 through 0.3.9, 0.4.0 through 0.4.6, 0.5.0 through 0.5.2, and 0.6.0 through 0.6.11 allow prototype pollution through set(). When the path passed to set() crosses a primitive value, the next path segment is resolved on that primitive's built-in prototype, so an application that passes an untrusted path to set() lets an attacker add or overwrite properties of String.prototype, Number.prototype, or Boolean.prototype using plain JSON data, for example traverse({ name: 'bob' }).set(['name', '__proto__', 'polluted'], 'yes'). Object.prototype was reachable only with a non-data path segment, such as an object whose toString returns a different value on each call, or through a Proxy that accepts an assignment without storing it. This is fixed in 0.3.10, 0.4.7, 0.5.3, and 0.6.12.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 20:36 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
harborist CNA under the redhat root
CNA scorecard B 85/100 over 12 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
ljharb traverse Affected: 0.3.6 , < 0.3.10 (semver)
Affected: 0.4.0 , < 0.4.7 (semver)
Affected: 0.5.0 , < 0.5.3 (semver)
Affected: 0.6.0 , < 0.6.12 (semver)
guessed Create a notification for this product.
Show details on NVD website
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              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-1321",
                  "description": "CWE-1321 Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-07T19:35:15.351Z",
            "orgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158",
            "shortName": "harborist"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://github.com/ljharb/js-traverse/security/advisories/GHSA-rj28-8w7x-jmqc"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/ljharb/js-traverse/commit/81ccab43e379cf42eb2a5f689630f7f79b3d71b8"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/ljharb/js-traverse/commit/37a9ebd103d2a259c824c29cdcc3f0dfe1acffce"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eUpgrade to traverse 0.6.12 or later, or, on older release lines, to 0.5.3, 0.4.7, or 0.3.10.\u003c/p\u003e"
                }
              ],
              "value": "Upgrade to traverse 0.6.12 or later, or, on older release lines, to 0.5.3, 0.4.7, or 0.3.10."
            }
          ],
          "source": {
            "advisory": "GHSA-rj28-8w7x-jmqc",
            "discovery": "INTERNAL"
          },
          "title": "traverse: set() can write to built-in prototypes via an untrusted path",
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eDo not pass untrusted paths to set(). If that is not possible, require every path segment to be a string other than __proto__, constructor, or prototype, and confirm that each intermediate value along the path is an object before calling set().\u003c/p\u003e"
                }
              ],
              "value": "Do not pass untrusted paths to set(). If that is not possible, require every path segment to be a string other than __proto__, constructor, or prototype, and confirm that each intermediate value along the path is an object before calling set()."
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158",
        "assignerShortName": "harborist",
        "cveId": "CVE-2026-107353",
        "datePublished": "2026-10-07T19:35:15.351Z",
        "dateReserved": "2026-10-07T19:20:21.848Z",
        "dateUpdated": "2026-10-07T20:37:09.233Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.