CVE-2026-5246

Summary

A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Affected Software

VendorProductVersion RangeStatus
CesantaMongoose7.0affected
CesantaMongoose7.1affected
CesantaMongoose7.2affected
CesantaMongoose7.3affected
CesantaMongoose7.4affected
CesantaMongoose7.5affected
CesantaMongoose7.6affected
CesantaMongoose7.7affected
CesantaMongoose7.8affected
CesantaMongoose7.9affected
CesantaMongoose7.10affected
CesantaMongoose7.11affected
CesantaMongoose7.12affected
CesantaMongoose7.13affected
CesantaMongoose7.14affected
CesantaMongoose7.15affected
CesantaMongoose7.16affected
CesantaMongoose7.17affected
CesantaMongoose7.18affected
CesantaMongoose7.19affected
CesantaMongoose7.20affected
CesantaMongoose7.21unaffected

Weaknesses

  • CWE-639: Authorization Bypass
  • CWE-285: Improper Authorization

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

References