Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cesanta | Mongoose | >= 7.0, < 7.21 |
Related Weaknesses (CWE)
References
- https://github.com/cesanta/mongoose/Product
- https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8aPatch
- https://github.com/cesanta/mongoose/releases/tag/7.21ProductRelease Notes
- https://vuldb.com/submit/770063ExploitThird Party AdvisoryVDB Entry
- https://vuldb.com/vuln/354825Third Party AdvisoryVDB Entry
- https://vuldb.com/vuln/354825/ctiPermissions RequiredVDB Entry
FAQ
What is CVE-2026-5244?
CVE-2026-5244 is a vulnerability with a CVSS score of 7.3 (HIGH). 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 pub...
How severe is CVE-2026-5244?
CVE-2026-5244 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-5244?
Check the references section above for vendor advisories and patch information. Affected products include: Cesanta Mongoose.