Is CVE-2026-5244 actively exploited?

No active exploitation of CVE-2026-5244 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-5244 be exploited remotely?

Yes. CVE-2026-5244 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-5244?

CVE-2026-5244 has a CVSS score of 7.3 (HIGH).

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HIGH

CVE-2026-5244

CWE-119Published: April 2, 2026· Updated: Apr 3, 2026

7.3

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:18.2th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-5244 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.