Stack-based buffer overflow in ESP-IDF - CVE-2026-55687
Published: June 24, 2026
Vulnerability identifier: #VU135121
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55687
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in the JPEG decoder header parser when parsing a crafted DQT marker in a JPEG file. A remote attacker can supply a specially crafted JPEG image to cause a denial of service.
Code execution may be possible on builds without strong stack protection, but this has not been demonstrated.
Affected software
ESP-IDF
How to mitigate CVE-2026-55687
Install security update from vendor's website.
ESP-IDF - addressed in versions 5.2.8, 5.3.6, 5.4.5, 5.5.5, 6.0.2