CVE-2026-123562

HIGH 7.5

Devalue 5.8.0 before 5.9.3 Denial of Service via stringifyAsync Unhandled Rejection

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

devalue (sveltejs/devalue) 5.8.0 before 5.9.3 contains an unhandled promise rejection in stringifyAsync: when serializing multiple promises, a later promise rejecting before an earlier one settles leaves an internal rejection unhandled, even if the caller catches the returned promise. An attacker able to influence the timing or failure of serialized asynchronous values can terminate the Node.js process.

CWE	CWE-248
Vendor	sveltejs
Product	devalue
Published	Nov 8, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

sveltejs / devalue

5.8.0 < 5.9.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/sveltejs/devalue/security/advisories/GHSA-x5rw-q4pp-hg5g vulncheck.com: https://www.vulncheck.com/advisories/devalue-5.8.0-before-5.9.3-denial-of-service-via-stringifyasync-unhandled-rejection

Credits

elliott-with-the-longest-name-on-github