🛡️ CVE-2026-6985 on Ubuntu — swupdate

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-6985 as tracked by Ubuntu, for the package swupdate. No fixed version has been recorded for this distribution yet.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability low.

Affected software and timeline

Affected software: swupdate. Published on 25 April 2026 and last revised on 24 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)

CVE-2026-6985 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS 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
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-04-25
Updated 2026-08-11
Modified 2026-06-24
Fix URL N/A

Affected Packages

Software From version Fixed in
swupdate — —

Vulnerability Monitoring

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More UBUNTU CVE 2026 advisories

Part of UBUNTU CVE 2026 in the advisory index.