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Vulnerability record · CVE-2026-38427 · published 27 May 2026

CVE-2026-38427: Heap-based buffer overflow vulnerability

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.

7.3 CVSS 3.1 High EPSS 0.43% · top 64.8% CWE-122 · Heap-based buffer overflow Deferred
7.3CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

LinkTags
https://github.com/arendst/Tasmota/blob/c207cc2/tasmota/tasmota_xdrv_driver/xdrv_10_scripter.ino
https://github.com/sermikr0/CVE-2026-38427
https://github.com/sermikr0/CVE-2026-38427

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Source: NIST National Vulnerability Database (record CVE-2026-38427), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.