| Título | The Trusted Domain Project OpenDMARC 1.4.2 NULL Pointer Dereference |
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| Descrição | OpenDMARC contains an invalid pointer dereference in its built-in SPF parser when processing a malformed IPv6 literal in an `ip6:` mechanism. In `opendmarc_spf_ipv6_explode()`, the parser may advance past a failed delimiter search and subsequently dereference an invalid address, causing the process to crash.
A remote unauthenticated attacker can trigger the vulnerability by publishing a crafted SPF record under a domain they control and sending a message from that domain. Successful exploitation terminates the OpenDMARC process, disrupting DMARC and SPF evaluation and potentially causing a denial of service in mail processing.
The issue affects builds configured with `--with-spf` that use OpenDMARC’s internal SPF implementation. Builds linked against `libspf2` do not reach the affected code path. |
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| Fonte | ⚠️ https://weitongli.com/share/opendmarc-ip6-wild-pointer.html |
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| Utilizador | WeitongLi (UID 100239) |
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| Submissão | 06/08/2026 12h10 (há 2 meses) |
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| Moderação | 27/09/2026 09h55 (2 months later) |
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| Estado | Aceite |
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| Entrada VulDB | 410840 [Trusted Domain Project OpenDMARC até 1.4.2 SPF Parser opendmarc_spf.c opendmarc_spf_ipv6_explode cp Negação de Serviço] |
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| Pontos | 20 |
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