CVE-2026-5245: A vulnerability was found in Cesanta Mongoose up to 7.20. This impacts the function handle_mdns_record of the file…
CVE-2026-5245 · Severity: medium · CVSS 5.6 · Published 2026-04-02
A vulnerability was found in Cesanta Mongoose up to 7.20. This impacts the function handle_mdns_record of the file mongoose.c of the component mDNS Record Handler. Performing a manipulation of the argument buf results in stack-based buffer overflow. Remote exploitation of the attack is possible. A high degree of complexity is needed for the attack. The exploitability is said to be difficult. The exploit has been made public and could be used. Upgrading to version 7.21 will fix this issue. The patch is named 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. You should 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.
No. Junglewise Threat Intelligence has no report of CVE-2026-5245 being exploited in the wild.
How severe is CVE-2026-5245?
Medium severity, with a CVSS score of 5.6, published 2 April 2026.
Which products and versions are affected?
Cesanta Mongoose. The advisory does not name versions.
Is there a fix for CVE-2026-5245?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-5245?
Check whether you run Cesanta Mongoose. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.