Vulnerability-Lookup

GHSA-R937-WJX7-W2JP

Vulnerability from github – Published: 2026-06-26 15:32 – Updated: 2026-08-12 19:25

Summary

JetBrains Kotlin: Unsafe Deserialization in Kotlin Build Cache Enables Code Execution

Details

In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata

Severity

6.7 (Medium)


                  
                    CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.jetbrains.kotlin:kotlin-gradle-plugin"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.20-Beta1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-53914"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-12T19:25:23Z",
    "nvd_published_at": "2026-06-26T14:17:05Z",
    "severity": "MODERATE"
  },
  "details": "In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata",
  "id": "GHSA-r937-wjx7-w2jp",
  "modified": "2026-08-12T19:25:23Z",
  "published": "2026-06-26T15:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53914"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JetBrains/kotlin/commit/bf51df665b458fda7c3eaf436c4d88dc119d7ec6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/JetBrains/kotlin"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JetBrains/kotlin/releases/tag/v2.4.20-Beta1"
    },
    {
      "type": "WEB",
      "url": "https://www.jetbrains.com/privacy-security/issues-fixed"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "JetBrains Kotlin: Unsafe Deserialization in Kotlin Build Cache Enables Code Execution"
}

CVE-2026-53914 (GCVE-0-2026-53914)

Vulnerability from cvelistv5 – Published: 2026-06-26 13:01 – Updated: 2026-06-27 03:55

Summary

In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata

Severity

6.7 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-26 00:00 UTC

CWE

CWE-502
CWE-502 - Deserialization of Untrusted Data

Assigner

JetBrains mitre root

References

1 reference

URL	Tags
https://www.jetbrains.com/privacy-security/issues…

Impacted products

1 product

Vendor	Product	Version
JetBrains	Kotlin	Affected: 0 , < 2.4.20 (semver)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-53914",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-26T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-502",
                "description": "CWE-502 Deserialization of Untrusted Data",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-27T03:55:26.966Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Kotlin",
          "vendor": "JetBrains",
          "versions": [
            {
              "lessThan": "2.4.20",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-26T13:01:00.434Z",
        "orgId": "547ada31-17d8-4964-bc5f-1b8238ba8014",
        "shortName": "JetBrains"
      },
      "references": [
        {
          "url": "https://www.jetbrains.com/privacy-security/issues-fixed/"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "547ada31-17d8-4964-bc5f-1b8238ba8014",
    "assignerShortName": "JetBrains",
    "cveId": "CVE-2026-53914",
    "datePublished": "2026-06-26T13:01:00.434Z",
    "dateReserved": "2026-06-11T13:00:42.498Z",
    "dateUpdated": "2026-06-27T03:55:26.966Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-R937-WJX7-W2JP

CVE-2026-53914 (GCVE-0-2026-53914)

Tags

Sightings

Nomenclature