CVE-2026-38427: n/a
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.
AI Analysis
Technical Summary
This vulnerability exists in Tasmota firmware's fetch_jpg() function where the Content-Length from a JPEG stream is stored in a uint16_t variable. If the Content-Length exceeds 65535, it wraps around, causing the program to allocate a buffer smaller than the incoming data. This leads to a heap buffer overflow condition. The flaw affects Tasmota versions through 15.3.0.3. No CVSS score or vendor advisory is available, and no patch or mitigation details have been published.
Potential Impact
Heap buffer overflow can lead to memory corruption, which may cause application crashes or potentially allow an attacker to execute arbitrary code remotely. However, no known exploits in the wild have been reported, and the exact impact beyond the overflow condition is not detailed in the available information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution when processing untrusted JPEG streams with affected Tasmota versions. No vendor-provided mitigation or workaround is currently documented.
CVE-2026-38427: n/a
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 v3.1
Score 7.3high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability exists in Tasmota firmware's fetch_jpg() function where the Content-Length from a JPEG stream is stored in a uint16_t variable. If the Content-Length exceeds 65535, it wraps around, causing the program to allocate a buffer smaller than the incoming data. This leads to a heap buffer overflow condition. The flaw affects Tasmota versions through 15.3.0.3. No CVSS score or vendor advisory is available, and no patch or mitigation details have been published.
Potential Impact
Heap buffer overflow can lead to memory corruption, which may cause application crashes or potentially allow an attacker to execute arbitrary code remotely. However, no known exploits in the wild have been reported, and the exact impact beyond the overflow condition is not detailed in the available information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution when processing untrusted JPEG streams with affected Tasmota versions. No vendor-provided mitigation or workaround is currently documented.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-04-06T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a16f9d0e29bf47b50c0e791
Added to database: 05/27/2026, 14:04:00 UTC
Last enriched: 05/27/2026, 15:18:54 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 59
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