What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-10 · updated 2026-10-25
• Weakness: CWE-121

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.

Affected products

• espressif esp-idf: from 6.0.0, < 6.0.2; from 5.5.0, <= 5.5.4; from 5.4.0, <= 5.4.4; through 5.3.5

References

• 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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