Medium severity5.3NVD Advisory· Published Apr 25, 2026· Updated Apr 29, 2026
CVE-2026-6985
CVE-2026-6985
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.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
5- github.com/dwBruijn/CVEs/blob/main/Mongoose/TCP_opt_dos.mdnvdExploitThird Party Advisory
- vuldb.com/submit/796230nvdThird Party AdvisoryVDB Entry
- vuldb.com/vuln/359528nvdThird Party AdvisoryVDB Entry
- github.com/cesanta/mongoose/releases/tag/7.21nvdProductRelease Notes
- vuldb.com/vuln/359528/ctinvdPermissions RequiredVDB Entry
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