---
id: CVE-2026-88388
title: >-
  Espruino 2v29 (commit bffc6d0) contains a stack-based buffer overflow
  vulnerability in the JavaScript error stack-trace handling path on 64-bit
  builds
summary: >-
  Espruino 2v29 (commit bffc6d0) contains a stack-based buffer overflow
  vulnerability in the JavaScript error stack-trace handling path on 64-bit
  builds. A remote attacker can supply JavaScript input that triggers an
  exception and reaches …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-121
published: '2026-09-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T16:17:29.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88388'
references:
  - url: >-
      https://github.com/espruino/Espruino/commit/ecd7d43e084ba9aafa8245609347fe0f4383b38c
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00171
epssPercentile: 0.05761
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-25T15:14:04.581717Z'
ingestedAt: '2026-09-24T20:51:40.267Z'
---

## Overview

Espruino 2v29 (commit bffc6d0) contains a stack-based buffer overflow vulnerability in the JavaScript error stack-trace handling path on 64-bit builds. A remote attacker can supply JavaScript input that triggers an exception and reaches jslPrintTokenLineMarker(), which passes the address of a 4-byte int column variable to jsvGetLineAndCol() as a size_t pointer. jsvGetLineAndCol() performs an 8-byte write through the mismatched pointer, overwriting adjacent stack memory.

## Remediation

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