CVE-2026-123569
Devalue before 5.6.3 Denial of Service via Sparse Array Serialization
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| 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
0 < 5.6.3
References
Credits
elliott-with-the-longest-name-on-github