CVE-2026-55687

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 69% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 10, 2026

Advisory Details (7)

Auto-updated Jul 10, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Stack-Based Out-of-Bounds Write in JPEG Decoder DQT Marker Parsing · Advisory · espressif/esp-idf · GitHub

https://github.com/espressif/esp-idf/security/advisories/GHSA-v6r2-f6p2-88cj
github_release Patch Available

ESP-IDF Release v6.0.2

Patch available: espressif/esp-idf v6.0.2

https://github.com/espressif/esp-idf/releases/tag/v6.0.2
github_commit

commit f2df45bcedef (espressif/esp-idf)

Fix landed in espressif/esp-idf commit f2df45bcedef — awaiting tagged release

https://github.com/espressif/esp-idf/commit/f2df45bcedef11354e83c31a9718d680a68422c4
github_commit

commit 82c5c2dad453 (espressif/esp-idf)

Fix landed in espressif/esp-idf commit 82c5c2dad453 — awaiting tagged release

https://github.com/espressif/esp-idf/commit/82c5c2dad45313786fb7e973059bc9094d95c3b2
github_commit

commit 7ccfc00f39fa (espressif/esp-idf)

Fix landed in espressif/esp-idf commit 7ccfc00f39fa — awaiting tagged release

https://github.com/espressif/esp-idf/commit/7ccfc00f39faf1b7e5919f45b56fe44ba699d7c1
github_commit

commit 6ffafe8e9314 (espressif/esp-idf)

Fix landed in espressif/esp-idf commit 6ffafe8e9314 — awaiting tagged release

https://github.com/espressif/esp-idf/commit/6ffafe8e93142ef8ffe51a6311d4abfc0f10fe77
github_commit

commit 303c01305acb (espressif/esp-idf)

Fix landed in espressif/esp-idf commit 303c01305acb — awaiting tagged release

https://github.com/espressif/esp-idf/commit/303c01305acb8ae5c4eb24a1786300681b4822a4

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-28 00:56 UTCEG score recompute
  2. 2026-07-27 00:28 UTCEG score recompute
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-26 12:11 UTCEG score recompute
  5. 2026-07-25 14:18 UTCEPSS rescore
  6. 2026-07-24 14:18 UTCEPSS rescore
  7. 2026-07-23 14:18 UTCEPSS rescore
  8. 2026-07-23 03:20 UTCEG score recompute
  9. 2026-07-22 14:08 UTCEPSS rescore
  10. 2026-07-21 15:25 UTCEPSS rescore
  11. 2026-07-20 17:08 UTCEPSS rescore
  12. 2026-07-19 14:31 UTCEPSS rescore
  13. 2026-07-19 14:31 UTCEPSS rescore
  14. 2026-07-19 02:29 UTCEPSS rescore
  15. 2026-07-18 10:04 UTCEPSS rescore
  16. 2026-07-16 17:03 UTCEPSS rescore
  17. 2026-07-15 16:57 UTCEPSS rescore
  18. 2026-07-15 16:57 UTCEPSS rescore
  19. 2026-07-15 02:00 UTCEPSS rescore
  20. 2026-07-15 02:00 UTCEPSS rescore
  21. 2026-07-13 22:31 UTCEPSS rescore
  22. 2026-07-13 06:13 UTCEPSS rescore
  23. 2026-07-13 06:13 UTCEPSS rescore
  24. 2026-07-12 05:46 UTCEPSS rescore
  25. 2026-07-10 16:34 UTCEG score recompute
Show 1 more
  1. 2026-07-10 16:32 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55687?
CVE-2026-55687 is a high vulnerability published on July 10, 2026. 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 jpegparsedqtmarker() in components/espdriverjpeg/jpegparsemarker.c because the attacker-controlled DQT marker Tq nibble is used as an…
When was CVE-2026-55687 disclosed?
CVE-2026-55687 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55687 actively exploited?
CVE-2026-55687 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.9% of all scored CVEs.
What is the CVSS score of CVE-2026-55687?
CVE-2026-55687 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-55687?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55687, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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