---
title: "CVE-2026-88830: BusyBox - Buffer Overflow"
description: "BusyBox contains a heap buffer overflow caused by unit confusion in TLS Montgomery reduction buffer allocation when processing a crafted ClientKeyExchange message, letting remote attackers cause memory corruption, exploit requires crafted message."
url: https://panop.io/threat-heartbeat/CVE-2026-88830/
---

# CVE-2026-88830 BusyBox - Buffer Overflow

BusyBox contains a heap buffer overflow caused by unit confusion in TLS Montgomery reduction buffer allocation when processing a crafted ClientKeyExchange message, letting remote attackers cause memory corruption, exploit requires crafted message.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.35% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-88830)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution

CVSS vector

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

Published

23 September 2026

Updated

15 October 2026

Weakness

[CWE-131](https://cwe.mitre.org/data/definitions/131.html)

## Vendor fix

Update to the latest version of BusyBox.

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-2026-88830](https://nvd.nist.gov/vuln/detail/CVE-2026-88830)
- [https://access.redhat.com/security/cve/CVE-2026-88830](https://access.redhat.com/security/cve/CVE-2026-88830)
- [https://bugzilla.redhat.com/show\_bug.cgi?id=2531344](https://bugzilla.redhat.com/show_bug.cgi?id=2531344)

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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

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