CVE-2026-5244

Summary

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.

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-122: Heap-based Buffer Overflow
  • CWE-119: Memory Corruption

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References