CVE-2026-123569
Published:November 08, 2026
Updated:November 09, 2026
The devalue package for npm before 5.6.3 can consume excessive CPU and memory when serializing sparse arrays with uneval or stringify. An attacker who manages to get a sparse array created on the server, which mainstream wire formats do not allow, and serialized there can cause a denial of service.
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) >=3.0.1 <5.6.3 || >=2.0.0 <5.6.3 || >=4.0.0 <5.6.3 || >=1.0.0 <5.6.3 || >=5.0.0 <5.6.3Fix Suggestion:
Update to version 5.6.3Related Resources (7)
Do you need more information?
Contact UsCVSS 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
Exploit Maturity
UNREPORTED
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)
Allocation of Resources Without Limits or Throttling
EPSS
Base Score:
0.34