CVE-2026-88388Network attack vector

Stack corruption via mismatched line-column pointer

Published Sep 24, 2026 · Updated Sep 24, 2026

Stack-based buffer overflow in Espruino 2v29 allows remote attackers to corrupt stack memory through JavaScript that raises an exception. The jslPrintTokenLineMarker() error-stack path passes a 4-byte int column address to jsvGetLineAndCol() as a size_t pointer, causing an 8-byte write into the smaller object. Only 64-bit builds are affected; the published record establishes adjacent stack-memory corruption but does not establish code execution or a reliable service crash.

CVSS severityUnavailable
Unscored
EPSS probability0.32%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Espruino 2v29 allows remote attackers to corrupt stack memory through JavaScript that raises an exception. The jslPrintTokenLineMarker() error-stack path passes a 4-byte int column address to jsvGetLineAndCol() as a size_t pointer, causing an 8-byte write into the smaller object. Only 64-bit builds are affected; the published record establishes adjacent stack-memory corruption but does not establish code execution or a reliable service crash.

The record

CVE
CVE-2026-88388
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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