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CVE-2026-6985

Cesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop

Published: Apr 25, 2026Updated: Apr 29, 2026 Sources: CVE List NVDCWE-404
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.6%
Top 57.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-404CWE-835

Affected Products

MongooseCesantaOSS Libraries
mongoosecesantaOSS Libraries
cesantaoss-projectOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://vuldb.com/vuln/359528
vuldb.com
https://vuldb.com/vuln/359528/cti
vuldb.com
https://vuldb.com/submit/796230
vuldb.com
and 2 more references View all →

Timeline

Published
Apr 25, 2026
Last Updated
Apr 29, 2026

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