CVE-2026-88358

Simdjson Library Heap Out‑of‑Bounds Read Leading to Denial of Service

Published Sep 24, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Simdjson Library Heap Out‑of‑Bounds Read Leading to Denial of Service
Type Values Removed Values Added
Title Out-of-Bounds Read in simdjson Parser Leading to Denial of Service
Weaknesses CWE-119
CWE-20
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'}

Type Values Removed Values Added
First Time appeared Simdjson Project
Simdjson Project simdjson
Vendors & Products Simdjson Project
Simdjson Project simdjson
Type Values Removed Values Added
Title Out-of-Bounds Read in simdjson Parser Leading to Denial of Service
Weaknesses CWE-119
CWE-20
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
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 29, 2026, 2:26 AM
Reserved
Sep 10, 2026, 12:00 AM
Status
Awaiting Analysis
Published
Sep 24, 2026, 4:17 PM
Modified
Sep 29, 2026, 3:17 AM