CVE-2026-6985

Summary

A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handle_opt of the file /src/net_builtin.c of the component TCP Option Handler. This manipulation of the argument optlen causes infinite loop. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 7.21 is able to resolve this issue. Upgrading the affected component is advised. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.

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-835: Infinite Loop
  • CWE-404: Denial of Service

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: yes
    • Technical Impact: partial

References