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 ↗

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

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

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