---
id: CVE-2026-88358
title: >-
  simdjson 4.6.1 contains a one-byte out-of-bounds read vulnerability in
  dom::parser::parse_unpadded()
summary: >-
  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_…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
published: '2026-09-24'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T03:17:19.610'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88358'
references:
  - url: >-
      https://github.com/simdjson/simdjson/commit/20b28712ffce8320237b75a587d35a2e89140577
    label: cve@mitre.org
  - url: 'https://github.com/simdjson/simdjson/issues/2815'
    label: cve@mitre.org
  - url: 'https://github.com/simdjson/simdjson/pull/2817'
    label: cve@mitre.org
  - url: 'https://github.com/simdjson/simdjson/issues/2815'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-29T02:25:09.093346Z'
ingestedAt: '2026-09-24T15:45:56.660Z'
epss: 0.00394
epssPercentile: 0.33426
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.