| Título | IrfanView 4.76.0.0 (x64) Heap-based Buffer Overflow |
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| Descrição | IrfanView's TIFF loader can be told to parse an embedded "Wang annotation" record which is a legacy scanned-document annotation format identified by TIFF tag 32932. The record carries its own 4-byte length field for a text payload. That length is used to size a heap allocation and to determine the size of a subsequent read into it. The issue is that the two uses of the 4-byte length disagree due to integer overflow: a length of 0xFFFFFFFF makes the allocation zero bytes while the read still tries to copy up to 4 GB of data into it. The attacker can control how much data is written regardless of the integer overflow's result. In other words, the attacker is not forced to write 4 GB of data.
The attacker has full control over the overflow size and content.
Check advisory for more details and PoC. |
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| Fonte | ⚠️ https://github.com/dwBruijn/CVEs/blob/main/IrfanView/TIFF/Tiff_Wang.md |
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| Utilizador | dwbruijn (UID 93926) |
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| Submissão | 07/10/2026 15h07 (há 30 dias) |
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| Moderação | 03/11/2026 15h22 (27 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 430288 [IrfanView 4.76.0.0 em Win64 TIFF Wang Annotation Excesso de tampão] |
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| Pontos | 20 |
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