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CVE-2026-55687

7.5 · HIGH

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework.

Published Jul 10, 2026CWE-121EPSS 0.70%

Overview

CVE-2026-55687 is a high-severity vulnerability. It was published on July 10, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/espressif/esp-idf/commit/303c01305acb8ae5c4eb24a1786300681b4822a4GitHubgithub.com/espressif/esp-idf/commit/6ffafe8e93142ef8ffe51a6311d4abfc0f10fe77GitHubgithub.com/espressif/esp-idf/commit/7ccfc00f39faf1b7e5919f45b56fe44ba699d7c1GitHubgithub.com/espressif/esp-idf/commit/82c5c2dad45313786fb7e973059bc9094d95c3b2GitHubgithub.com/espressif/esp-idf/commit/f2df45bcedef11354e83c31a9718d680a68422c4GitHubgithub.com/espressif/esp-idf/releases/tag/v6.0.2GitHubgithub.com/espressif/esp-idf/security/advisories/GHSA-v6r2-f6p2-88cj

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55687?

CVE-2026-55687 is a high-severity vulnerability. It was published on July 10, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-55687?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-55687?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55687?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55687 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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