---
title: "CVE-2026-73252: Mongoose - Denial of Service"
description: "Mongoose < 7.23 contains a denial of service caused by improper TLS 1.3 record size validation in mg_tls_recv_record(), letting unauthenticated malicious TLS peers trigger heap out-of-bounds read, exploit requires network access."
url: https://panop.io/threat-heartbeat/CVE-2026-73252/
---

# CVE-2026-73252 Mongoose - Denial of Service

Mongoose < 7.23 contains a denial of service caused by improper TLS 1.3 record size validation in mg\_tls\_recv\_record(), letting unauthenticated malicious TLS peers trigger heap out-of-bounds read, exploit requires network access.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-73252)

## Details

Type

Denial of Service

Impact

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

14 October 2026

Updated

15 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to version 7.23 or later.

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-2026-73252](https://nvd.nist.gov/vuln/detail/CVE-2026-73252)
- [https://github.com/cesanta/mongoose/commit/758e301f0c9a9885c1b716195df5fe6d6ac9d53e](https://github.com/cesanta/mongoose/commit/758e301f0c9a9885c1b716195df5fe6d6ac9d53e)
- [https://github.com/cesanta/mongoose/releases/tag/7.23](https://github.com/cesanta/mongoose/releases/tag/7.23)
- [https://github.com/cesanta/mongoose/security/advisories/GHSA-hq58-98f5-2wg3](https://github.com/cesanta/mongoose/security/advisories/GHSA-hq58-98f5-2wg3)

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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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