An out-of-bounds write vulnerability was identified in the dkim_canon_selecthdrs function of the libopendkim/dkim-canon.c file in Trusted Domain Project OpenDKIM versions 2.0 through 2.11.0. This vulnerability allows remote attackers to manipulate the argument 'h' to cause an out-of-bounds write, potentially leading to memory corruption or other impacts. The vulnerability is publicly disclosed with available exploit code, but the vendor has not responded or issued a fix.

Successful exploitation of this vulnerability could allow remote attackers to perform an out-of-bounds write, which may result in memory corruption. This could potentially lead to denial of service or other undefined behavior. However, no specific impact such as code execution or privilege escalation is explicitly described in the provided data.

No official patch or vendor advisory is available at this time. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, users should consider mitigating exposure by restricting access to the OpenDKIM service or applying other environment-specific controls.