CVE-2026-55687

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (51st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

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 advisoryMentions a patch (unverified)

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 11× in last 7d / 35× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 138 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 38 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-10-01 15:11 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  22. 2026-09-28 09:48 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.7% · 51st percentile
Show 75 more
  1. 2026-09-24 11:13 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  3. 2026-09-23 05:46 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  6. 2026-09-18 05:19 UTCEG score recompute
  7. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  11. 2026-09-13 23:40 UTCEG score recompute
  12. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-09-12 15:07 UTCEG score recompute
  14. 2026-09-12 02:57 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  16. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  18. 2026-09-08 02:54 UTCEG score recompute
  19. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  20. 2026-09-06 13:57 UTCEG score recompute
  21. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  22. 2026-09-05 21:44 UTCEG score recompute
  23. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  24. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  25. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  26. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  27. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  28. 2026-08-30 06:25 UTCEG score recompute
  29. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  30. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  31. 2026-08-27 21:41 UTCEG score recompute
  32. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  33. 2026-08-27 00:48 UTCEG score recompute
  34. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  35. 2026-08-26 03:39 UTCEG score recompute
  36. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  37. 2026-08-24 20:15 UTCEG score recompute
  38. 2026-08-23 05:41 UTCEG score recompute
  39. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  40. 2026-08-22 04:52 UTCEG score recompute
  41. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  42. 2026-08-21 03:45 UTCEG score recompute
  43. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  44. 2026-08-20 01:32 UTCEG score recompute
  45. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  46. 2026-08-18 22:52 UTCEG score recompute
  47. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  48. 2026-08-17 22:12 UTCEG score recompute
  49. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  50. 2026-08-16 20:40 UTCEG score recompute
  51. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  52. 2026-08-16 08:30 UTCEG score recompute
  53. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  54. 2026-08-15 08:10 UTCEG score recompute
  55. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  56. 2026-08-14 07:49 UTCEG score recompute
  57. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  58. 2026-08-12 18:50 UTCEG score recompute
  59. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  60. 2026-08-11 18:30 UTCEG score recompute
  61. 2026-08-11 06:19 UTCEG score recompute
  62. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  63. 2026-08-09 17:20 UTCEG score recompute
  64. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  65. 2026-08-08 17:00 UTCEG score recompute
  66. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  67. 2026-08-07 16:39 UTCEG score recompute
  68. 2026-08-06 16:19 UTCEG score recompute
  69. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  70. 2026-08-06 04:09 UTCEG score recompute
  71. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  72. 2026-08-04 15:39 UTCEG score recompute
  73. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  74. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  75. 2026-08-03 15:19 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-55687?
CVE-2026-55687 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-55687 published?
The CVE record for CVE-2026-55687 was published on July 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 10, 2026; the record at its source may have been updated since.
Is CVE-2026-55687 actively exploited?
CVE-2026-55687 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55687?
CVE-2026-55687 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55687?
A fix for CVE-2026-55687 is available: update to the fixed version the vendor names in its advisory.

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