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.
History

Tue, 29 Sep 2026 06:45:00 +0000

Type Values Removed Values Added
Title Simdjson Library Heap Out‑of‑Bounds Read Leading to Denial of Service

Tue, 29 Sep 2026 05:15:00 +0000

Type Values Removed Values Added
Title Out-of-Bounds Read in simdjson Parser Leading to Denial of Service
Weaknesses CWE-119
CWE-20

Tue, 29 Sep 2026 03:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-125
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 27 Sep 2026 11:15:00 +0000

Type Values Removed Values Added
First Time appeared Simdjson Project
Simdjson Project simdjson
Vendors & Products Simdjson Project
Simdjson Project simdjson

Sat, 26 Sep 2026 03:30:00 +0000

Type Values Removed Values Added
Title Out-of-Bounds Read in simdjson Parser Leading to Denial of Service
Weaknesses CWE-119
CWE-20

Thu, 24 Sep 2026 15:45:00 +0000

Type Values Removed Values Added
Description 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.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-09-24T00:00:00.000Z

Updated: 2026-09-29T02:26:36.211Z

Reserved: 2026-09-10T00:00:00.000Z

Link: CVE-2026-88358

cve-icon Vulnrichment

Updated: 2026-09-29T02:26:08.819Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-24T16:17:13.090

Modified: 2026-09-29T03:17:19.610

Link: CVE-2026-88358

cve-icon Redhat

No data.