---
cve: "CVE-2026-55687"
severity: "HIGH"
cvss: 7.5
epss: "0.7%"
vendor: "espressif"
kev: false
exploited: false
published: "2026-07-10 17:16:59"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-02T03:47:01+02:00"
---

# CVE-2026-55687

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 303c01305acb8ae5c4eb24a1786300681b4822a4 (Commit)
- 6ffafe8e93142ef8ffe51a6311d4abfc0f10fe77 (Commit)

## Referenzen

- <https://github.com/espressif/esp-idf/security/advisories/GHSA-v6r2-f6p2-88cj>
- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55687) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_