CVE-2026-123564 PUBLISHED

Sveltejs devalue from 1.0.0 before 5.9.3 contains a memory exhaustion flaw in uneval, whose generated code for sparse arrays allocates memory proportional to the array's declared length when evaluated. Attackers who can influence a very large sparse array serialized by an application can exhaust memory in the browser or runtime evaluating the output.

• elliott-with-the-longest-name-on-github remediation developer

• GitHub Security Advisory (GHSA-wf3x-273g-mvxv)
• VulnCheck Advisory: Sveltejs devalue before 5.9.3 Memory Exhaustion via uneval Sparse Arrays

• Allocation of Resources Without Limits or Throttling CWE