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Vulnerability record · CVE-2026-55687 · published 10 July 2026

CVE-2026-55687: Stack-based buffer overflow vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.70% · top 48.7% CWE-121 · Stack-based buffer overflowCWE-787 · Out-of-bounds write Deferred
7.5CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
10 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://github.com/espressif/esp-idf/commit/303c01305acb8ae5c4eb24a1786300681b4822a4
https://github.com/espressif/esp-idf/commit/6ffafe8e93142ef8ffe51a6311d4abfc0f10fe77
https://github.com/espressif/esp-idf/commit/7ccfc00f39faf1b7e5919f45b56fe44ba699d7c1
https://github.com/espressif/esp-idf/commit/82c5c2dad45313786fb7e973059bc9094d95c3b2
https://github.com/espressif/esp-idf/commit/f2df45bcedef11354e83c31a9718d680a68422c4
https://github.com/espressif/esp-idf/releases/tag/v6.0.2
https://github.com/espressif/esp-idf/security/advisories/GHSA-v6r2-f6p2-88cj

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Source: NIST National Vulnerability Database (record CVE-2026-55687), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.