CVE-2026-88358

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

simdjson 4.6.1 contains a one-byte out-of-bounds read vulnerability in dom::parser::parse_unpadded(). A specially crafted truncated JSON document whose final structural token closes a nested array or object can cause json_iterator::walk_document() to access buf[len] after the input buffer has been exhausted. This results in a heap out-of-bounds read and may cause application termination, leading to denial of service.

Published 2026-09-24. Last modified 2026-09-29.