---
title: "CVE-2026-88388: Espruino - Buffer Overflow"
description: "Espruino 2v29 contains a stack-based buffer overflow caused by improper handling of JavaScript error stack-trace in 64-bit builds, letting remote attackers overwrite adjacent stack memory via crafted JavaScript input, exploit requires triggering an exception."
url: https://panop.io/threat-heartbeat/CVE-2026-88388/
---

# CVE-2026-88388 Espruino - Buffer Overflow

Espruino 2v29 contains a stack-based buffer overflow caused by improper handling of JavaScript error stack-trace in 64-bit builds, letting remote attackers overwrite adjacent stack memory via crafted JavaScript input, exploit requires triggering an exception.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.32% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-88388)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

24 September 2026

Updated

15 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest version of Espruino.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-88388](https://nvd.nist.gov/vuln/detail/CVE-2026-88388)
- [https://github.com/espruino/Espruino/commit/ecd7d43e084ba9aafa8245609347fe0f4383b38c](https://github.com/espruino/Espruino/commit/ecd7d43e084ba9aafa8245609347fe0f4383b38c)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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