CVE-2026-55687 ESF-IDF: Stack-Based Out-of-Bounds Write in JPEG Decoder DQT Marker Parsing
Attackers can cause denial of service via stack memory corruption in the JPEG decoder by sending malformed DQT markers in ESP-IDF.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-55687?
CVE-2026-55687 is a high-severity memory corruption vulnerability in espressif esp-idf, published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-55687?
How do I fix CVE-2026-55687?
No fix has been published for CVE-2026-55687 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-55687 being exploited?
There is no known exploitation of CVE-2026-55687 in the wild and no public exploit code.
Sources
Also known as GHSA-v6r2-f6p2-88cj.