CVE-2026-38426 Details
Description
Buffer Overflow vulnerability in arendst Tasmota v.15.3.0.3 and before allows a remote attacker to execute arbitrary code via the xdrv_10_scripter.ino, fetch_jpg(), jpg_task.boundary[40], strcpy() function.
A buffer overflow vulnerability has been identified in Arendst Tasmota versions through 15.3.0.3. The issue arises in the 'xdrv_10_scripter.ino' file, specifically within the 'fetch_jpg()' function. The vulnerability allows remote attackers to execute arbitrary code by exploiting the 'strcpy()' function, which copies the MJPEG boundary string from the HTTP 'Content-Type' header into a fixed 40-byte buffer without proper length validation. This oversight enables attackers to overflow the buffer, corrupt adjacent heap memory, and potentially execute malicious code on the device.
Users can upgrade to Tasmota version 15.3.0.4 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 27, 2026CISA-ADP
Assessed May 27, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/sermikr0/CVE-2026-38426 | CISA-ADP | AdvisoryExploitRemedy |
| https://github.com/arendst/Tasmota/blob/c207cc2/tasmota/tasmota_xdrv_driver/xdrv_10_scripter.ino | [email protected] | Source CodeVendor |
| https://github.com/sermikr0/CVE-2026-38426 | [email protected] | AdvisoryExploitRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-120 | Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| arendst Tasmota | <= 15.3.0.3 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 27, 2026 | CVE Modified | CISA-ADP |
| May 27, 2026 | New CVE Received | [email protected] |