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CVE-2026-115863

Quick assessment

Affected
ConnMan ConnMan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ConnMan 在 2.0 版本之前存在一个基于栈的缓冲区溢出漏洞，该漏洞可通过 DHCPv6 Reply 消息触发。问题出现在 文件中的 函数：该函数将 DHCPv6 的 DOMAIN_LIST（选项 24）值中固定 1025 字节（NS_MAXDNAME）的数据复制到栈上大小为 1026 字节的缓冲区 中，而完全忽略了选项的实际长度；随后，代码通过一个无界循环 遍历 DNS 标签。攻击者可构造一个包含长度大于或等于 1025 个非零字节的 DOMAIN_LIST 选项的恶意 DHCPv6 REPLY 消息，使标

CVSS 7.6 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
ConnMan ConnMan ≤ 2.0 affected
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I. Basic Information for CVE-2026-115863

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
ConnMan through 2.0 has a stack-based buffer overflow via a DHCPv6 Reply message. This occurs in get_domains in gdhcp/client.c. It copies a fixed NS_MAXDNAME (1025) bytes from a DHCPv6 DOMAIN_LIST (option 24) value into a 1026-byte stack buffer dns_name regardless of the actual option length, then walks DNS labels with an unbounded "c += jump + 1" loop. A crafted DHCPv6 REPLY with a DOMAIN_LIST option of >= 1025 non-zero bytes makes the label walk leave the buffer and read/write '.' past its end in attacker-chosen strides. An on-link attacker can trigger this without authentication via a forged Router Advertisement (O=1) and a forged DHCPv6 REPLY matching xid/CLIENTID with a long DOMAIN_LIST. The impact is unauthenticated on-link crash of connmand (runs as root). This was introduced in bb06c47.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ConnMan ConnMan 0 ~ 2.0 -

II. Public POCs for CVE-2026-115863

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III. Intelligence Information for CVE-2026-115863

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Patches & Fixes for CVE-2026-115863 (1)

Mailing List Discussions for CVE-2026-115863 (1)

IV. Related Vulnerabilities

Same product: ConnMan
Same vendor: ConnMan
Same weakness: CWE-121

V. Comments for CVE-2026-115863

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