Is CVE-2026-6985 actively exploited?

CVE-2026-6985 has no public evidence of in-the-wild exploitation as of 2026-04-25.

What is the CVSS score for CVE-2026-6985?

CVE-2026-6985 has a CVSS score of 5.5 (MEDIUM severity). Vector: 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.

How do I patch CVE-2026-6985?

Vendor patch guidance is linked from the references on this page. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-6985.

Which products are affected by CVE-2026-6985?

Affected products for CVE-2026-6985 are listed on this page once vendor data becomes available.

CVE-2026-6985 - remediation guidance & executive summary

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.

CVSS Metrics

Vector: 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
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-404 CWE-835

Metadata

Primary Vendor: UNKNOWN
Published: 4/25/2026
Last Modified: 4/25/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-6985

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary