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GHSA-33HQ-FVWR-56PM

Vulnerability from github – Published: 2026-02-19 20:29 – Updated: 2026-02-19 20:29
VLAI
Summary
devalue affected by CPU and memory amplification from sparse arrays
Details

Under certain circumstances, serializing sparse arrays using uneval or stringify could cause CPU and/or memory exhaustion. When this occurs on the server, it results in a DoS. This is extremely difficult to take advantage of in practice, as an attacker would have to manage to create a sparse array on the server — which is impossible in every mainstream wire format — and then that sparse array would have to be run through uneval or stringify.

Severity
1.7 (Low)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.6.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "devalue"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.6.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-19T20:29:30Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "Under certain circumstances, serializing sparse arrays using `uneval` or `stringify` could cause CPU and/or memory exhaustion. When this occurs on the server, it results in a DoS. This is extremely difficult to take advantage of in practice, as an attacker would have to manage to create a sparse array on the server \u2014 which is impossible in every mainstream wire format \u2014 and then that sparse array would have to be run through `uneval` or `stringify`.",
  "id": "GHSA-33hq-fvwr-56pm",
  "modified": "2026-02-19T20:29:30Z",
  "published": "2026-02-19T20:29:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/devalue/security/advisories/GHSA-33hq-fvwr-56pm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/devalue/commit/819f1ac7475ab37547645cfb09bf2f678a799cf0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sveltejs/devalue"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/devalue/releases/tag/v5.6.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "devalue affected by CPU and memory amplification from sparse arrays"
}



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