GHSA-X5RW-Q4PP-HG5G

Vulnerability from github – Published: 2026-10-01 15:15 – Updated: 2026-10-01 15:15
VLAI
Summary
devalue: stringifyAsync can cause an unhandled rejection despite a caught returned promise
Details

When serializing multiple promises, a later promise can reject before an earlier one settles. An internal rejected promise remains unhandled even if the caller catches the returned stringifyAsync promise. Under Node's default unhandled-rejection behavior this can terminate the process. Applications whose asynchronous failures/timing can be influenced by requests are potentially exposed.

This is essentially impossible to exploit, and is much more likely to surface as a developer-introduced bug.

Severity
8.2 (High)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.9.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "devalue"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.8.0"
            },
            {
              "fixed": "5.9.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-248",
      "CWE-755"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-01T15:15:13Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "When serializing multiple promises, a later promise can reject before an earlier one settles. An internal rejected promise remains unhandled even if the caller catches the returned `stringifyAsync` promise. Under Node\u0027s default unhandled-rejection behavior this can terminate the process. Applications whose asynchronous failures/timing can be influenced by requests are potentially exposed.\n\nThis is essentially impossible to exploit, and is much more likely to surface as a developer-introduced bug.",
  "id": "GHSA-x5rw-q4pp-hg5g",
  "modified": "2026-10-01T15:15:13Z",
  "published": "2026-10-01T15:15:13Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/devalue/security/advisories/GHSA-x5rw-q4pp-hg5g"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/devalue/commit/dae8153e9d7541b975cc4018138d6cebec6c1199"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sveltejs/devalue"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/devalue/releases/tag/v5.9.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "devalue: stringifyAsync can cause an unhandled rejection despite a caught returned promise"
}



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