CVE-2026-123568
Published:November 08, 2026
Updated:November 09, 2026
Sveltejs devalue before 5.6.3 contains a prototype pollution vulnerability that allows attackers to alter object prototypes by supplying untrusted data to uneval. When the generated code is later evaluated, it creates objects with polluted prototypes, producing output data whose shape differs from the original input.
Affected Packages
https://github.com/sveltejs/devalue.git (GITHUB):
Affected version(s) >=v1.0.0 <v5.6.3 || >=v2.0.0 <v5.6.3 || >=v3.0.1 <v5.6.3 || >=v4.0.0 <v5.6.3 || >=v5.0.0 <v5.6.3Fix Suggestion:
Update to version v5.6.3devalue (NPM):
Affected version(s) >=1.0.0 <5.6.3 || >=5.0.0 <5.6.3 || >=2.0.0 <5.6.3 || >=3.0.1 <5.6.3 || >=4.0.0 <5.6.3Fix Suggestion:
Update to version 5.6.3Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improperly Controlled Modification of Object Prototype Attributes
EPSS
Base Score:
0.20