---
title: "CVE-2026-115863: ConnMan - Buffer Overflow"
description: "ConnMan through 2.0 contains a stack-based buffer overflow caused by improper handling of DHCPv6 DOMAIN_LIST option in get_domains function, letting unauthenticated on-link attackers cause a crash via crafted DHCPv6 Reply messages."
url: https://panop.io/threat-heartbeat/CVE-2026-115863/
---

# CVE-2026-115863 ConnMan - Buffer Overflow

ConnMan through 2.0 contains a stack-based buffer overflow caused by improper handling of DHCPv6 DOMAIN\_LIST option in get\_domains function, letting unauthenticated on-link attackers cause a crash via crafted DHCPv6 Reply messages.

CVSS base score 7.6 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.41% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-115863)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

CVSS vector

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

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to a version later than 2.0 or apply patches fixing the buffer overflow in DHCPv6 handling.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-115863](https://nvd.nist.gov/vuln/detail/CVE-2026-115863)
- [https://git.kernel.org/pub/scm/network/connman/connman.git/commit/?id=bb06c47101ca243fa5c04fb4b03fe2a12420d280](https://git.kernel.org/pub/scm/network/connman/connman.git/commit/?id=bb06c47101ca243fa5c04fb4b03fe2a12420d280)
- [https://git.kernel.org/pub/scm/network/connman/connman.git/tree/gdhcp/client.c](https://git.kernel.org/pub/scm/network/connman/connman.git/tree/gdhcp/client.c)
- [https://lore.kernel.org/connman/179274561161.81299.4579745057858200074@pm.me/](https://lore.kernel.org/connman/179274561161.81299.4579745057858200074@pm.me/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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