CVE-2026-30040

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-26. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

A heap overflow in the FSViewer.exe process of FastStone Image Viewer v8.3 allows attackers to cause a execute arbitrary code in the context of the current process via supplying a crafted JPEG 2000 (JP2) file.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 26, 2026

Advisory Details (2)

Auto-updated Jun 26, 2026
No patch confirmed yet. Sources: cert.
generic

Download FastStone Image Viewer

https://www.faststone.org/FSIVDownload.htm
cert

VU#936962 - Multiple file parsing vulnerabilities in FastStone Image Viewer 8.3.0.0

https://kb.cert.org/vuls/id/936962

Vendor Advisories for CVE-2026-30040(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 55× 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.

Showing the most recent 100 of 163 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-30040?
CVE-2026-30040 is a medium vulnerability published on June 26, 2026. A heap overflow in the FSViewer.exe process of FastStone Image Viewer v8.3 allows attackers to cause a execute arbitrary code in the context of the current process via supplying a crafted JPEG 2000 (JP2) file.
When was CVE-2026-30040 disclosed?
CVE-2026-30040 was first published in the National Vulnerability Database on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-30040 actively exploited?
CVE-2026-30040 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 61.1% of all scored CVEs.
What is the CVSS score of CVE-2026-30040?
CVE-2026-30040 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-30040?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-30040, 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.

Dependency Blast Radius

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