CVE-2026-6985
CVE-2026-6985 · Cesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 6.9 · Medium · EPSS 0.6% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
mongoose
- Versions
- 7.0: Affected
- 7.1: Affected
- 7.2: Affected
- 7.3: Affected
- 7.4: Affected
- 7.5: Affected
- 7.6: Affected
- 7.7: Affected
- 7.8: Affected
- 7.9: Affected
- 7.10: Affected
- 7.11: Affected
- 7.12: Affected
- 7.13: Affected
- 7.14: Affected
- 7.15: Affected
- 7.16: Affected
- 7.17: Affected
- 7.18: Affected
- 7.19: Affected
- 7.20: Affected
- 7.21: Not affected
Update to 7.21
swupdate Debian:12
- Versions
- 2022.12+dfsg-4
- 2022.12+dfsg-4+deb12u1
- 2022.12+dfsg-4+deb12u1~bpo11+1
- 2022.12+dfsg-4+deb12u2
- 2023.05+dfsg-1
- 2023.05+dfsg-2
- 2023.05+dfsg-2~bpo12+1
- 2023.05+dfsg-3
- 2023.05+dfsg-4
- 2023.05+dfsg-5
- 2023.05+dfsg-5~bpo12+1
- 2023.12+dfsg-1
- 2023.12+dfsg-1~bpo12+1
- 2023.12.1+dfsg-1
- 2023.12.1+dfsg-1~bpo12+1
- 2023.12.1+dfsg-2
- 2023.12.1+dfsg-2~bpo12+1
- 2024.05+dfsg-1
- 2024.05.2+dfsg-1
- 2024.05.2+dfsg-2
- 2024.05.2+dfsg-2~bpo12+1
- 2024.12+dfsg-1
- 2024.12+dfsg-2
- 2024.12+dfsg-2~bpo12+1
- 2024.12.1+dfsg-1
- 2024.12.1+dfsg-1~bpo12+1
- 2024.12.1+dfsg-2
- 2024.12.1+dfsg-3
- 2024.12.1+dfsg-3~bpo12+1
- 2025.05+dfsg-1
- 2025.05+dfsg-2
- 2025.05+dfsg-2~bpo13+1
- 2025.05+dfsg-3
- 2025.05+dfsg-3~bpo13+1
- 2025.12+dfsg-1
- 2025.12+dfsg-10
- 2025.12+dfsg-10~bpo13+1
- 2025.12+dfsg-10~bpo13+2
- 2025.12+dfsg-2
- 2025.12+dfsg-2~bpo13+1
- 2025.12+dfsg-3
- 2025.12+dfsg-4
- 2025.12+dfsg-5
- 2025.12+dfsg-6
- 2025.12+dfsg-7
- 2025.12+dfsg-7~bpo13+1
- 2025.12+dfsg-8
- 2025.12+dfsg-9
- 2026.05+dfsg-1
- 2026.05+dfsg-2
- 2026.05+dfsg-3
- 2026.05+dfsg-3~bpo13+1
- 2026.05+dfsg-4
- 2026.05.1+dfsg-1
- 2026.05.1+dfsg-1~bpo13+1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
swupdate Debian:13
- Versions
- 2024.12.1+dfsg-3
- 2024.12.1+dfsg-3+deb13u1
- 2024.12.1+dfsg-3+deb13u2
- 2025.05+dfsg-1
- 2025.05+dfsg-2
- 2025.05+dfsg-2~bpo13+1
- 2025.05+dfsg-3
- 2025.05+dfsg-3~bpo13+1
- 2025.12+dfsg-1
- 2025.12+dfsg-10
- 2025.12+dfsg-10~bpo13+1
- 2025.12+dfsg-10~bpo13+2
- 2025.12+dfsg-2
- 2025.12+dfsg-2~bpo13+1
- 2025.12+dfsg-3
- 2025.12+dfsg-4
- 2025.12+dfsg-5
- 2025.12+dfsg-6
- 2025.12+dfsg-7
- 2025.12+dfsg-7~bpo13+1
- 2025.12+dfsg-8
- 2025.12+dfsg-9
- 2026.05+dfsg-1
- 2026.05+dfsg-2
- 2026.05+dfsg-3
- 2026.05+dfsg-3~bpo13+1
- 2026.05+dfsg-4
- 2026.05.1+dfsg-1
- 2026.05.1+dfsg-1~bpo13+1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
swupdate Debian:14
- Versions
- 2024.12.1+dfsg-3
- 2025.05+dfsg-1
- 2025.05+dfsg-2
- 2025.05+dfsg-2~bpo13+1
- 2025.05+dfsg-3
- 2025.05+dfsg-3~bpo13+1
- 2025.12+dfsg-1
- 2025.12+dfsg-10~bpo13+1
- 2025.12+dfsg-10~bpo13+2
- 2025.12+dfsg-2
- 2025.12+dfsg-2~bpo13+1
- 2025.12+dfsg-3
- 2025.12+dfsg-4
- 2025.12+dfsg-5
- 2025.12+dfsg-6
- 2025.12+dfsg-7
- 2025.12+dfsg-7~bpo13+1
- 2025.12+dfsg-8
- 2025.12+dfsg-9
- Affected ranges
- ECOSYSTEM: < 2025.12+dfsg-10
Update to 2025.12+dfsg-10
swupdate Ubuntu:22.04:LTS
- Versions
- 2020.11-2
- 2021.04-1.1
- 2021.04-2
- 2021.04-2build1
- 2021.11-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
swupdate Ubuntu:24.04:LTS
- Versions
- 2023.05+dfsg-3
- 2023.05+dfsg-4
- 2023.05+dfsg-4build1
- 2023.05+dfsg-5
- 2023.12+dfsg-1
- 2023.12.1+dfsg-1ubuntu1
- 2023.12.1+dfsg-1ubuntu4
- 2023.12.1+dfsg-1ubuntu5
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
swupdate Ubuntu:25.10
- Versions
- 2024.12.1+dfsg-1build2
- 2024.12.1+dfsg-2
- 2024.12.1+dfsg-3
- 2025.05+dfsg-2ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
swupdate Ubuntu:26.10
- Versions
- 2025.12+dfsg-4ubuntu1
- 2026.05+dfsg-3ubuntu2
- 2026.05+dfsg-4ubuntu1
- 2026.05.1+dfsg-1ubuntu1
- 2026.05.1+git20261001+dfsg-1ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
swupdate Ubuntu:26.04:LTS
- Versions
- 2025.05+dfsg-2ubuntu1
- 2025.05+dfsg-3ubuntu1
- 2025.12+dfsg-1ubuntu1
- 2025.12+dfsg-2ubuntu1
- 2025.12+dfsg-3ubuntu1
- 2025.12+dfsg-4ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published