CVE-2026-44041

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 66% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
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.

UltraVNC through 1.8.2.2 contains an out-of-bounds read in the wide-string to multibyte conversion helper. In rfb/dh.cpp:204, the vncWc2Mb() function passes a caller-supplied WCHAR pointer to wcslen() before any bounds check. If the caller provides a wide-character buffer that is not properly NUL-terminated, wcslen() reads past the end of the buffer until it encounters a NUL wchar, resulting in an out-of-bounds read. Under typical Win32 API usage this requires an abnormal caller contract. Impact is limited to a potential information disclosure from adjacent memory regions or a process crash (denial of service) if the over-read crosses a page boundary.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 9, 2026

Advisory Details (2)

Auto-updated Jul 1, 2026
No patch confirmed yet.
generic

Home - UltraVNC VNC OFFICIAL SITE, Remote Desktop Free Opensource

https://uvnc.com/
generic

GitHub - ultravnc/UltraVNC: 👁️ UltraVNC Server, UltraVNC Viewer, UltraVNC Repeater and UltraVNC SC | Official repository: https://github.com/ultravnc/UltraVNC · GitHub

https://github.com/ultravnc/UltraVNC

Vendor Advisories for CVE-2026-44041(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 8× in last 7d / 56× 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 156 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-44041?
CVE-2026-44041 is a medium vulnerability published on July 1, 2026. UltraVNC through 1.8.2.2 contains an out-of-bounds read in the wide-string to multibyte conversion helper. In rfb/dh.cpp:204, the vncWc2Mb() function passes a caller-supplied WCHAR pointer to wcslen() before any bounds check. If the caller provides a wide-character buffer that is not properly…
When was CVE-2026-44041 disclosed?
CVE-2026-44041 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44041 actively exploited?
CVE-2026-44041 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 65.2% of all scored CVEs.
What is the CVSS score of CVE-2026-44041?
CVE-2026-44041 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-44041?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44041, 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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