---
id: CVE-2026-55687
title: ESF-IDF is the Espressif Internet of Things (IOT) Development Framework
summary: >-
  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 …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-121
  - CWE-787
published: '2026-07-10'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55687'
references:
  - url: >-
      https://github.com/espressif/esp-idf/commit/303c01305acb8ae5c4eb24a1786300681b4822a4
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/6ffafe8e93142ef8ffe51a6311d4abfc0f10fe77
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/7ccfc00f39faf1b7e5919f45b56fe44ba699d7c1
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/82c5c2dad45313786fb7e973059bc9094d95c3b2
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/commit/f2df45bcedef11354e83c31a9718d680a68422c4
    label: security-advisories@github.com
  - url: 'https://github.com/espressif/esp-idf/releases/tag/v6.0.2'
    label: security-advisories@github.com
  - url: >-
      https://github.com/espressif/esp-idf/security/advisories/GHSA-v6r2-f6p2-88cj
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.007
epssPercentile: 0.51138
ingestedAt: '2026-07-11T20:15:26.097Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.