---
id: CVE-2026-88389
title: >-
  Espruino 2v29 (commit bffc6d0) contains a NULL pointer dereference
  vulnerability in jslGetRawString() in src/jslex.c
summary: >-
  Espruino 2v29 (commit bffc6d0) contains a NULL pointer dereference
  vulnerability in jslGetRawString() in src/jslex.c. Crafted raw/binary string
  input can cause the lexer to pass a NULL iterator target to jsvLockAgain(). In
  RELEASE/NO_ASS…
severity: medium
cvss: 6.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
published: '2026-09-25'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T17:32:07.107'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88389'
references:
  - url: >-
      https://github.com/espruino/Espruino/commit/0db0663ac5201a6fea68094b45da673edec45187
    label: cve@mitre.org
  - url: 'https://github.com/espruino/Espruino/issues/2745'
    label: cve@mitre.org
  - url: 'https://github.com/espruino/Espruino/issues/2745'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00161
epssPercentile: 0.05256
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-29T03:18:57.521290Z'
ingestedAt: '2026-09-25T15:10:56.370Z'
---

## Overview

Espruino 2v29 (commit bffc6d0) contains a NULL pointer dereference vulnerability in jslGetRawString() in src/jslex.c. Crafted raw/binary string input can cause the lexer to pass a NULL iterator target to jsvLockAgain(). In RELEASE/NO_ASSERT builds, the missing assertion guard allows a write through the NULL pointer, resulting in memory corruption and application termination or denial of service.

## Remediation

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