{"id":"GHSA-wf3x-273g-mvxv","aliases":[],"url":"https://o3.security/vulnerability/GHSA-wf3x-273g-mvxv","summary":"devalue: Sparse arrays emitted by uneval cause eager allocation when evaluated","details":"Evaluating legitimate `uneval` output for a sparse array can allocate memory proportional to its declared length. A tiny serialized value can therefore cause large memory allocation in a consuming browser/runtime. This occurs during evaluation of generated code, not in default `parse` sparse-array construction.\n\nYou would only be affected by this if you were serializing very large sparse arrays and then evaluating the results. In the general use case for `uneval` of sending data to the client, the worst that could happen is the browser tab running out of memory.","published":"2026-10-01T15:17:13Z","modified":"2026-10-01T15:30:13.280047533Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"devalue","fixedVersion":"5.9.3"}],"fix":{"url":"https://github.com/sveltejs/devalue/commit/6861dbbb7e548849e48bce718e88747a298f7250","label":"sveltejs/devalue@6861dbb"},"references":[{"type":"WEB","url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-wf3x-273g-mvxv"},{"type":"WEB","url":"https://github.com/sveltejs/devalue/commit/6861dbbb7e548849e48bce718e88747a298f7250"},{"type":"PACKAGE","url":"https://github.com/sveltejs/devalue"},{"type":"WEB","url":"https://github.com/sveltejs/devalue/releases/tag/v5.9.3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-01T15:30:13.280047533Z"}}