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Vulnerability · Published Oct 23, 2026 · Assigned by mitre

CVE-2026-115863

High 7.6

In plain English

A high-severity stack buffer overflow in ConnMan from ConnMan. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)7.6High
Exploit odds (30 days)0.3%top 77.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12connmanno fix listedDEBIAN-CVE-2026-115863
Debian:13connmanno fix listedDEBIAN-CVE-2026-115863
Debian:14connmanno fix listedDEBIAN-CVE-2026-115863
Ubuntu:22.04:LTSconnmanno fix listedUBUNTU-CVE-2026-115863
Ubuntu:24.04:LTSconnmanno fix listedUBUNTU-CVE-2026-115863
Ubuntu:26.04:LTSconnmanno fix listedUBUNTU-CVE-2026-115863
Ubuntu:26.10connmanno fix listedUBUNTU-CVE-2026-115863

Affected products (as reported)

VendorProductVersions
ConnMan ConnMan 0 – through 2.0

Weakness: CWE-121 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

References