| Titel | lwIP Project lwIP 2.2.1 and earlier Heap-based Buffer Overflow |
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| Beschreibung | A heap-based out-of-bounds write exists in the lwIP MQTT client. In mqtt_parse_incoming(), the MQTT Remaining Length field is parsed without enforcing the protocol limit of four encoded bytes. A broker can send a malformed Remaining Length containing excessive continuation bytes, causing msg_idx to advance beyond the fixed rx_buffer and overwrite adjacent heap memory.
The issue was reproduced with AddressSanitizer using a crafted MQTT input. The lwIP maintainer confirmed the issue and marked Savannah bug #68590 as fixed, with the fix planned for lwIP 2.2.2. |
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| Quelle | ⚠️ https://savannah.nongnu.org/bugs/?68590 |
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| Benutzer | xuyun (UID 100919) |
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| Einreichung | 01.09.2026 04:48 (vor 2 Monaten) |
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| Moderieren | 10.10.2026 17:18 (1 month later) |
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| Status | Duplikat |
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| VulDB Eintrag | 408720 [lwIP bis 2.2.1 MQTT Pufferüberlauf] |
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| Punkte | 0 |
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