espressif esp-idf up to 6.0.1 JPEG Parser jpeg_parse_marker.c jpeg_parse_dqt_marker Tq out-of-bounds write

Summaryinfo

A vulnerability labeled as problematic has been found in espressif esp-idf up to 6.0.1. The affected element is the function jpeg_parse_dqt_marker of the file components/esp_driver_jpeg/jpeg_parse_marker.c of the component JPEG Parser. Executing a manipulation of the argument Tq can lead to out-of-bounds write. This vulnerability appears as CVE-2026-55687. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in espressif esp-idf up to 6.0.1. It has been declared as problematic. This vulnerability affects the function jpeg_parse_dqt_marker of the file components/esp_driver_jpeg/jpeg_parse_marker.c of the component JPEG Parser. The manipulation of the argument Tq with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. CVE summarizes:

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. Versions 6.0.1, 5.5.4, 5.4.4, 5.3.5, and possibly prior contain an out-of-bounds write in jpeg_parse_dqt_marker() in components/esp_driver_jpeg/jpeg_parse_marker.c because the attacker-controlled DQT marker Tq nibble is used as an index into the qt_tbl array without validating that it is in the range 0..3, allowing malformed JPEG input to corrupt stack memory and reliably trigger a denial of service. This issue is fixed in version 6.0.2 and is expected to be fixed in versions 5.5.5, 5.4.5, and 5.3.6.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-55687 since 06/17/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 6.0.2 eliminates this vulnerability.

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Productinfo

Vendor

• espressif

Name

• esp-idf

Version

• 6.0.0
• 6.0.1

Website

• Product: https://github.com/espressif/esp-idf/

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