| Título | The Trusted Domain Project OpenARC 1.0.0 NULL Pointer Dereference |
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| Descrição | OpenARC contains a NULL pointer dereference in `arc_parse_canon_t()` when processing the `c=` canonicalization tag of an ARC signature header. If the tag specifies only one canonicalization algorithm, the parser treats the omitted second value as NULL and passes it to a string-comparison function, causing a segmentation fault.
The single-value form is permitted by the applicable specification, which requires the omitted value to be replaced with a default. A remote unauthenticated attacker can trigger the vulnerability by sending a message containing a complete ARC header set with a single-value `c=` tag.
Successful exploitation crashes the ARC verification process and may interrupt mail processing, resulting in denial of service. |
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| Fonte | ⚠️ https://weitongli.com/share/openarc-c-tag-null-deref.html |
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| Utilizador | WeitongLi (UID 100239) |
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| Submissão | 06/08/2026 12h08 (há 2 meses) |
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| Moderação | 27/09/2026 10h22 (2 months later) |
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| Estado | Aceite |
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| Entrada VulDB | 410845 [Trusted Domain Project OpenARC até 1.0.0.Beta1 libopenarc libopenarc/arc-canon.c arc_parse_canon_t Negação de Serviço] |
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| Pontos | 20 |
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