CVE-2026-6985

April 25, 2026, 5:16 p.m.

5.5
Medium

Description

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.

Product(s) Impacted

Vendor Product Versions
Cesanta
  • Mongoose
  • 7.20, <7.21

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-404
Improper Resource Shutdown or Release
The product does not release or incorrectly releases a resource before it is made available for re-use.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a cesanta mongoose 7.20 / / / / / / /
a cesanta mongoose <7.21 / / / / / / /

References

https://github.com/cesanta/mongoose/releases/tag/7.21
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/TCP_opt_dos.md
https://vuldb.com/submit/796230
https://vuldb.com/vuln/359528
https://vuldb.com/vuln/359528/cti

Tags

[email protected]
CWE-404
2026-04-25
CVE-2026-6985

CVSS Score

5.5 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Attack Requirements: NONE
  • Privileges Required: NONE
  • User Interaction: NONE
  • Scope:
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: LOW
  • Exploit Maturity: PROOF_OF_CONCEPT

    • CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

    View Vector String

Timeline

Published: April 25, 2026, 5:16 p.m.
Last Modified: April 25, 2026, 5:16 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.