CVE-2026-5244: Cesanta Mongoose TLS 1.3 mongoose.c mg_tls_recv_cert heap-based overflow
A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mgtlsrecvcert 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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-5244?
CVE-2026-5244 has been classified as a high severity vulnerability due to its potential for heap-based overflow.
How do I fix CVE-2026-5244?
To remediate CVE-2026-5244, users should upgrade Cesanta Mongoose to a version later than 7.20.
What components are affected by CVE-2026-5244?
CVE-2026-5244 affects the TLS 1.3 Handler in the Cesanta Mongoose software version up to 7.20.
What type of vulnerability is CVE-2026-5244?
CVE-2026-5244 is classified as a heap-based overflow vulnerability.
Which function is vulnerable in CVE-2026-5244?
The vulnerability in CVE-2026-5244 resides in the function mg_tls_recv_cert within the source file mongoose.c.