Vulnerability-Lookup

GHSA-77VG-94RM-HX3P

Vulnerability from github – Published: 2026-05-14 20:23 – Updated: 2026-06-09 18:41

Summary

Svelte devalue: DoS via sparse array deserialization

Details

devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption.

Severity

7.5 (High)


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

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JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.8.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "devalue"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.3"
            },
            {
              "fixed": "5.8.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42570"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-14T20:23:47Z",
    "nvd_published_at": "2026-06-09T17:17:07Z",
    "severity": "HIGH"
  },
  "details": "`devalue.parse` could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption.",
  "id": "GHSA-77vg-94rm-hx3p",
  "modified": "2026-06-09T18:41:24Z",
  "published": "2026-05-14T20:23:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42570"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sveltejs/devalue"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/devalue/releases/tag/v5.8.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Svelte devalue: DoS via sparse array deserialization"
}

CVE-2026-42570 (GCVE-0-2026-42570)

Vulnerability from cvelistv5 – Published: 2026-06-09 16:12 – Updated: 2026-06-09 18:06

Title

Svelte devalue: DoS via sparse array deserialization

Summary

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/sveltejs/devalue/security/advi…	x_refsource_CONFIRM
https://github.com/sveltejs/devalue/commit/206ca6…	x_refsource_MISC
https://github.com/sveltejs/devalue/releases/tag/v5.8.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
sveltejs	devalue	Affected: >= 5.6.3, < 5.8.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42570",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-09T18:06:15.435480Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-09T18:06:56.030Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "devalue",
          "vendor": "sveltejs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 5.6.3, \u003c 5.8.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn\u0027t sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "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:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T16:12:26.377Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p"
        },
        {
          "name": "https://github.com/sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d"
        },
        {
          "name": "https://github.com/sveltejs/devalue/releases/tag/v5.8.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sveltejs/devalue/releases/tag/v5.8.1"
        }
      ],
      "source": {
        "advisory": "GHSA-77vg-94rm-hx3p",
        "discovery": "UNKNOWN"
      },
      "title": "Svelte devalue: DoS via sparse array deserialization"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42570",
    "datePublished": "2026-06-09T16:12:26.377Z",
    "dateReserved": "2026-04-28T17:26:12.084Z",
    "dateUpdated": "2026-06-09T18:06:56.030Z",
    "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.

Action not permitted

GHSA-77VG-94RM-HX3P

CVE-2026-42570 (GCVE-0-2026-42570)

Tags

Sightings

Nomenclature