PT-2026-29692 · Cesanta · Mongoose

The_Evilsocket + 1 · Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-5244

Mitre

CVSS v3.1

7.3

High

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

A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mg tls recv cert of the file mongoose.c of the component TLS 1.3 Handler. Such manipulation of the argument pubkey leads to heap-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 7.21 mitigates this issue. The name of the patch is 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. It is advisable to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Fix

Heap Based Buffer Overflow

Buffer Overflow

Weakness Enumeration

CWE-122

CWE-119

Related Identifiers

CVE-2026-5244

Affected Products

Mongoose

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-5244 · Security Note
• https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1 · Patch
• https://github.com/cesanta/mongoose/releases/tag/7.21 · Patch
• https://vuldb.com/vuln/354825 · Note
• https://github.com/cesanta/mongoose · Note
• https://vuldb.com/submit/770063 · Note
• https://vuldb.com/vuln/354825/cti · Note