CVE-2026-115863 (GCVE-0-2026-115863)

Vulnerability from cvelistv5 – Published: 2026-10-23 17:35 – Updated: 2026-10-23 17:35
VLAI
Summary
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.
Severity
7.6 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CWE
  • CWE-121 - Stack-based Buffer Overflow
Assigner
mitre CNA under the mitre root
CNA scorecard E 29/100 over 2337 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
ConnMan ConnMan Affected: 0 , ≤ 2.0 (custom)
guessed Create a notification for this product.
Show details on NVD website
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    "datePublished": "2026-10-23T17:35:18.517Z",
    "dateReserved": "2026-10-23T17:35:18.141Z",
    "dateUpdated": "2026-10-23T17:35:18.517Z",
    "state": "PUBLISHED"
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        "cveTags": [],
        "descriptions": [
          {
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            "value": "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 \u003e= 1025 non-zero bytes makes the label walk leave the buffer and read/write \u0027.\u0027 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."
          }
        ],
        "id": "CVE-2026-115863",
        "lastModified": "2026-10-23T19:43:46.190",
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}



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