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CVE-2026-123562
Published:November 08, 2026
Updated:November 10, 2026
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.
Affected Packages
https://github.com/sveltejs/devalue.git (GITHUB):
Affected version(s) >=v5.8.0 <v5.9.3
Fix Suggestion:
Update to version v5.9.3
devalue (NPM):
Affected version(s) >=5.8.0 <5.9.3
Fix Suggestion:
Update to version 5.9.3
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Handling of Exceptional Conditions
Uncaught Exception
EPSS
Base Score:
0.34