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.

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Solution

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Workaround

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History

Wed, 27 May 2026 19:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-122
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 27 May 2026 17:15:00 +0000

Type Values Removed Values Added
Title Heap Buffer Overflow in Tasmota JPEG Stream Handler
Weaknesses CWE-120

Wed, 27 May 2026 14:15:00 +0000

Type Values Removed Values Added
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.
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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-27T18:20:24.531Z

Reserved: 2026-04-06T00:00:00.000Z

Link: CVE-2026-38427

cve-icon Vulnrichment

Updated: 2026-05-27T18:20:20.318Z

cve-icon NVD

Status : Deferred

Published: 2026-05-27T14:16:46.023

Modified: 2026-05-27T20:03:09.937

Link: CVE-2026-38427

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T17:00:17Z

Weaknesses