Is CVE-2026-6985 in the CISA KEV catalog?

No. CVE-2026-6985 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-6985?

CVE-2026-6985 has a CVSS v3 base score of 5.3 (MEDIUM).

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

CVE-2026-6985 has an EPSS score of 0.56% (43th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-6985?

Upgrade mongoose to 7.21 or later.

CVE & CISA-KEV Catalog

CVE-2026-6985

MEDIUM

5.3

CVSS v3

NVD

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.

CWE-404 CWE-835

How to fix

Remediation Available

mongooseNVD

Affected:>= 7.0, < 7.21Fixed in:7.21CVE-2026-6985derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

0.56%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Exploit1

github.com

Third-Party Advisory2

Release Notes1

github.com

VDB Entry1

vuldb.com

Related Vulnerabilities

Other CWE-404 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-44267	Medium	6.5	77%	-	Fix
CVE-2018-8120	High	7.0	74%	KEV + Ransom	-
CVE-2018-8210	High	7.8	25%	-	-
CVE-2018-8639	High	7.8	22%	KEV + Ransom	-
CVE-2023-3206	Medium	5.3	19%	-	-
CVE-2018-8450	High	8.8	16%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.