Device crash via unchecked JPEG table index
Published Jul 10, 2026 · Updated Jul 10, 2026
Out-of-bounds write in ESP-IDF 6.0.1, 5.5.4, 5.4.4, and 5.3.5 allows remote attackers to crash ESP32-P4 devices via malformed JPEG data. The jpeg_parse_dqt_marker() function uses the attacker-controlled Tq nibble as the first qt_tbl index without enforcing the array's 0 through 3 bound, overwriting adjacent stack memory. Exposure requires ESP32-P4 firmware to pass untrusted JPEG data to the hardware decoder; the demonstrated consequence is a repeatable stack-protector panic and device crash.
Summary
What happened
Out-of-bounds write in ESP-IDF 6.0.1, 5.5.4, 5.4.4, and 5.3.5 allows remote attackers to crash ESP32-P4 devices via malformed JPEG data. The jpeg_parse_dqt_marker() function uses the attacker-controlled Tq nibble as the first qt_tbl index without enforcing the array's 0 through 3 bound, overwriting adjacent stack memory. Exposure requires ESP32-P4 firmware to pass untrusted JPEG data to the hardware decoder; the demonstrated consequence is a repeatable stack-protector panic and device crash.
The record
- CVE
- CVE-2026-55687
- Published
- Jul 10, 2026
- Updated
- Jul 10, 2026
- Vendor
- Espressif Systems
- Product
- ESP-IDF
- Classifications
- CWE-787, CWE-121, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 10, 2026CVE publishedPublication date reported by the CVE source.
- Jul 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=<= 5.3.5
- Affected versionversion=>= 5.4.0, <= 5.4.4
- Affected versionversion=>= 5.5.0, <= 5.5.4
- Affected versionversion=>= 6.0.0, < 6.0.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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