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CVE-2026-55687— ESF-IDF: Stack-Based Out-of-Bounds Write in JPEG Decoder DQT Marker Parsing

Quick assessment

Affected
espressif esp-idf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Espressif ESP-IDF是中国Espressif公司开源的一个 Windows、Linux 和 macOS 上支持的 Espressif SoC 的开发框架。 Espressif ESP-IDF存在缓冲区错误漏洞，该漏洞源于在jpeg_parse_dqt_marker()函数中存在越界写入，因为攻击者控制的DQT标记Tq半字节被用作qt_tbl数组的索引，而未经验证是否在0..3范围内，可能导致恶意构造的JPEG输入破坏堆栈内存，从而可靠地触发拒绝服务。以下版本受到影响：6.0.1版本、5.5.

CVSS 7.5 · High EPSS 0.70% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
espressif esp-idf >= 6.0.0, < 6.0.2 affected
>= 5.5.0, <= 5.5.4 affected
>= 5.4.0, <= 5.4.4 affected
<= 5.3.5 affected
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I. Basic Information for CVE-2026-55687

Vulnerability Information
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Vulnerability Title
ESF-IDF: Stack-Based Out-of-Bounds Write in JPEG Decoder DQT Marker Parsing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
espressif esp-idf 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Espressif ESP-IDF是中国Espressif公司开源的一个 Windows、Linux 和 macOS 上支持的 Espressif SoC 的开发框架。 Espressif ESP-IDF存在缓冲区错误漏洞，该漏洞源于在jpeg_parse_dqt_marker()函数中存在越界写入，因为攻击者控制的DQT标记Tq半字节被用作qt_tbl数组的索引，而未经验证是否在0..3范围内，可能导致恶意构造的JPEG输入破坏堆栈内存，从而可靠地触发拒绝服务。以下版本受到影响：6.0.1版本、5.5.
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
espressif esp-idf >= 6.0.0, < 6.0.2 -

II. Public POCs for CVE-2026-55687

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III. Intelligence Information for CVE-2026-55687

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Patches & Fixes for CVE-2026-55687 (5)

Vendor Advisories for CVE-2026-55687 (1)

Vendor Pages for CVE-2026-55687 (1)

IV. Related Vulnerabilities

Same product: esp-idf
Same vendor: espressif
Same weakness: CWE-121

V. Comments for CVE-2026-55687

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