CVE-2026-54335 (GCVE-0-2026-54335)

Vulnerability from cvelistv5 – Published: 2026-07-17 20:56 – Updated: 2026-07-20 17:38
VLAI
Title
Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__
Summary
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In 5.0.44 and earlier, the _.merge(target, source) utility exported by @feathersjs/commons recursively merges source into target by iterating Object.keys(source). When source was produced by JSON.parse and contains a __proto__, constructor, or prototype key, that key is returned as an own-enumerable property; the recursive merge then resolves target['__proto__'] to Object.prototype and writes attacker-supplied properties onto it, polluting the prototype for all plain objects in the process for the lifetime of the Node process. This issue is fixed in version 5.0.45.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 17:37 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7832 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
feathersjs feathers Affected: < 5.0.45
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54335",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-20T17:37:43.562350Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-20T17:38:02.512Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "feathers",
          "vendor": "feathersjs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.0.45"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In 5.0.44 and earlier, the _.merge(target, source) utility exported by @feathersjs/commons recursively merges source into target by iterating Object.keys(source). When source was produced by JSON.parse and contains a __proto__, constructor, or prototype key, that key is returned as an own-enumerable property; the recursive merge then resolves target[\u0027__proto__\u0027] to Object.prototype and writes attacker-supplied properties onto it, polluting the prototype for all plain objects in the process for the lifetime of the Node process. This issue is fixed in version 5.0.45."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1321",
              "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-17T20:56:51.857Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh"
        },
        {
          "name": "https://github.com/feathersjs/feathers/pull/3690",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/feathersjs/feathers/pull/3690"
        },
        {
          "name": "https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc"
        },
        {
          "name": "https://github.com/feathersjs/feathers/releases/tag/v5.0.45",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/feathersjs/feathers/releases/tag/v5.0.45"
        }
      ],
      "source": {
        "advisory": "GHSA-28xv-ph75-77wh",
        "discovery": "UNKNOWN"
      },
      "title": "Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54335",
    "datePublished": "2026-07-17T20:56:51.857Z",
    "dateReserved": "2026-06-12T19:23:22.316Z",
    "dateUpdated": "2026-07-20T17:38:02.512Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-54335",
      "date": "2026-10-27",
      "epss": "0.00389",
      "percentile": "0.32831"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "feathers",
                "vendor": "feathersjs",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 5.0.45"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In 5.0.44 and earlier, the _.merge(target, source) utility exported by @feathersjs/commons recursively merges source into target by iterating Object.keys(source). When source was produced by JSON.parse and contains a __proto__, constructor, or prototype key, that key is returned as an own-enumerable property; the recursive merge then resolves target[\u0027__proto__\u0027] to Object.prototype and writes attacker-supplied properties onto it, polluting the prototype for all plain objects in the process for the lifetime of the Node process. This issue is fixed in version 5.0.45."
          },
          {
            "lang": "es",
            "value": "Feathersjs es un framework para crear APIs web y aplicaciones en tiempo real con TypeScript o JavaScript. En 5.0.44 y versiones anteriores, la utilidad _.merge(target, source) exportada por @feathersjs/commons fusiona recursivamente source en target al iterar Object.keys(source). Cuando source fue producido por JSON.parse y contiene una clave __proto__, constructor o prototype, esa clave se devuelve como una propiedad propia enumerable; la fusi\u00f3n recursiva luego resuelve target[\u2019__proto__\u2019] a Object.prototype y escribe propiedades proporcionadas por el atacante sobre ella, contaminando el prototipo para todos los objetos planos en el proceso durante la vida \u00fatil del proceso de Node. Este problema est\u00e1 solucionado en la versi\u00f3n 5.0.45."
          }
        ],
        "id": "CVE-2026-54335",
        "lastModified": "2026-10-24T20:10:00.137",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 3.7,
                "baseSeverity": "LOW",
                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 1.4,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-54335",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-20T17:37:43.562350Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-07-17T22:17:44.840",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/feathersjs/feathers/pull/3690"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/feathersjs/feathers/releases/tag/v5.0.45"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-1321"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-54335",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-07-20T17:37:43.562350Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-07-20T17:37:56.995Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "feathers",
              "vendor": "feathersjs",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 5.0.45"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In 5.0.44 and earlier, the _.merge(target, source) utility exported by @feathersjs/commons recursively merges source into target by iterating Object.keys(source). When source was produced by JSON.parse and contains a __proto__, constructor, or prototype key, that key is returned as an own-enumerable property; the recursive merge then resolves target[\u0027__proto__\u0027] to Object.prototype and writes attacker-supplied properties onto it, polluting the prototype for all plain objects in the process for the lifetime of the Node process. This issue is fixed in version 5.0.45."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 3.7,
                "baseSeverity": "LOW",
                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-1321",
                  "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-17T20:56:51.857Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/feathersjs/feathers/security/advisories/GHSA-28xv-ph75-77wh"
            },
            {
              "name": "https://github.com/feathersjs/feathers/pull/3690",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/feathersjs/feathers/pull/3690"
            },
            {
              "name": "https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/feathersjs/feathers/commit/28b3c03c63bdbff53115fdaa46c56980e7942acc"
            },
            {
              "name": "https://github.com/feathersjs/feathers/releases/tag/v5.0.45",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/feathersjs/feathers/releases/tag/v5.0.45"
            }
          ],
          "source": {
            "advisory": "GHSA-28xv-ph75-77wh",
            "discovery": "UNKNOWN"
          },
          "title": "Feathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-54335",
        "datePublished": "2026-07-17T20:56:51.857Z",
        "dateReserved": "2026-06-12T19:23:22.316Z",
        "dateUpdated": "2026-07-20T17:38:02.512Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.