sermikr0/CVE-2026-38427

sermikr0/CVE-2026-38427

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CVE-2026-38427 — Integer Wraparound → Heap Buffer Overflow in Tasmota fetch_jpg() uint16_t (Tasmota <= 15.3.0.3)
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CVE History

CVEPublishedCVSS v3CVSS v2
CVE-2026-38427↗
7.3 HIGH—

An issue in fetch_jpg() in xdrv_10_scripter.ino in Tasmota through 15.3.0.3 allows a remote attacker to cause heap buffer overflow. The Content-Length from a JPEG stream is stored in a uint16_t variable; values above 65535 wrap around, causing allocation of a smaller buffer than the data actually read.