CVE-2026-67305

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-01. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the server-provided size against the destination buffer. A malicious RDP server can send a response with a data payload significantly larger than requested, causing arbitrary heap memory corruption that may enable remote code execution when a user performs a paste operation.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

August 1, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Sep 8, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

FreeRDP Windows Client Cliprdr Virtual Channel Heap Buffer Overflow · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cj9v-h4hq-29jr
generic

FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr | Advisories | VulnCheck

https://www.vulncheck.com/advisories/freerdp-windows-client-before-heap-buffer-overflow-via-cliprdr

Vendor Advisories for CVE-2026-67305(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 20× in last 7d / 140× 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 316 total refreshes for this CVE.

  1. 2026-09-20 21:12 UTCEG score recompute
  2. 2026-09-20 21:12 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 01:18 UTCEG score recompute
  5. 2026-09-20 01:18 UTCGHSA enrichment
  6. 2026-09-19 13:44 UTCGHSA enrichment
  7. 2026-09-19 01:18 UTCEG score recompute
  8. 2026-09-19 01:18 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 13:21 UTCGHSA enrichment
  11. 2026-09-18 01:15 UTCEG score recompute
  12. 2026-09-18 01:15 UTCGHSA enrichment
  13. 2026-09-17 01:23 UTCEG score recompute
  14. 2026-09-17 01:23 UTCGHSA enrichment
  15. 2026-09-16 14:08 UTCEPSS rescore
  16. 2026-09-16 05:24 UTCEG score recompute
  17. 2026-09-16 05:24 UTCGHSA enrichment
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-15 03:03 UTCGHSA enrichment
  20. 2026-09-14 15:29 UTCGHSA enrichment
  21. 2026-09-14 03:50 UTCEG score recompute
  22. 2026-09-14 03:50 UTCGHSA enrichment
  23. 2026-09-13 16:17 UTCGHSA enrichment
  24. 2026-09-13 04:44 UTCGHSA enrichment
  25. 2026-09-12 17:10 UTCEG score recompute
Show 75 more
  1. 2026-09-12 17:10 UTCGHSA enrichment
  2. 2026-09-12 05:36 UTCGHSA enrichment
  3. 2026-09-11 18:02 UTCEG score recompute
  4. 2026-09-11 18:02 UTCGHSA enrichment
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 09:37 UTCEPSS rescore
  7. 2026-09-11 06:28 UTCGHSA enrichment
  8. 2026-09-10 18:54 UTCEG score recompute
  9. 2026-09-10 18:54 UTCGHSA enrichment
  10. 2026-09-10 07:19 UTCGHSA enrichment
  11. 2026-09-09 19:45 UTCGHSA enrichment
  12. 2026-09-09 06:57 UTCEG score recompute
  13. 2026-09-09 06:57 UTCGHSA enrichment
  14. 2026-09-08 22:01 UTCEPSS rescore
  15. 2026-09-08 16:13 UTCEG score recompute▼ 0.60
  16. 2026-09-08 16:13 UTCGHSA enrichment
  17. 2026-09-08 14:06 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
  18. 2026-09-08 02:59 UTCGHSA enrichment
  19. 2026-09-07 23:11 UTCGHSA enrichment
  20. 2026-09-07 19:18 UTCEG score recompute
  21. 2026-09-07 19:18 UTCGHSA enrichment
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-06 21:45 UTCGHSA enrichment
  24. 2026-09-06 17:57 UTCGHSA enrichment
  25. 2026-09-06 14:09 UTCEG score recompute
  26. 2026-09-06 14:09 UTCGHSA enrichment
  27. 2026-09-06 13:47 UTCEPSS rescore
  28. 2026-09-06 10:21 UTCGHSA enrichment
  29. 2026-09-06 06:34 UTCGHSA enrichment
  30. 2026-09-06 02:23 UTCGHSA enrichment
  31. 2026-09-05 22:34 UTCGHSA enrichment
  32. 2026-09-05 18:44 UTCEG score recompute
  33. 2026-09-05 18:44 UTCGHSA enrichment
  34. 2026-09-05 15:31 UTCEPSS rescore
  35. 2026-09-05 08:26 UTCGHSA enrichment
  36. 2026-09-05 04:38 UTCGHSA enrichment
  37. 2026-09-04 18:06 UTCGHSA enrichment
  38. 2026-09-04 14:16 UTCEG score recompute
  39. 2026-09-04 14:16 UTCGHSA enrichment
  40. 2026-09-04 10:25 UTCEG score recompute
  41. 2026-09-04 10:25 UTCGHSA enrichment
  42. 2026-09-04 05:07 UTCEPSS rescore
  43. 2026-09-04 03:40 UTCGHSA enrichment
  44. 2026-09-03 20:47 UTCGHSA enrichment
  45. 2026-09-03 09:04 UTCEG score recompute
  46. 2026-09-03 09:03 UTCGHSA enrichment
  47. 2026-09-02 14:12 UTCEPSS rescore
  48. 2026-09-02 07:57 UTCGHSA enrichment
  49. 2026-09-01 22:26 UTCEG score recompute
  50. 2026-09-01 22:26 UTCGHSA enrichment
  51. 2026-09-01 13:54 UTCEPSS rescore
  52. 2026-09-01 07:26 UTCEG score recompute
  53. 2026-09-01 07:26 UTCGHSA enrichment
  54. 2026-09-01 04:40 UTCEPSS rescore
  55. 2026-09-01 00:39 UTCGHSA enrichment
  56. 2026-08-31 20:47 UTCGHSA enrichment
  57. 2026-08-31 05:14 UTCGHSA enrichment
  58. 2026-08-31 01:26 UTCGHSA enrichment
  59. 2026-08-30 21:38 UTCEG score recompute
  60. 2026-08-30 21:38 UTCGHSA enrichment
  61. 2026-08-30 19:17 UTCEPSS rescore
  62. 2026-08-30 17:50 UTCGHSA enrichment
  63. 2026-08-30 14:01 UTCGHSA enrichment
  64. 2026-08-30 10:10 UTCGHSA enrichment
  65. 2026-08-30 05:53 UTCGHSA enrichment
  66. 2026-08-30 02:03 UTCEG score recompute
  67. 2026-08-30 02:03 UTCGHSA enrichment
  68. 2026-08-30 01:22 UTCEPSS rescore
  69. 2026-08-29 22:14 UTCEG score recompute
  70. 2026-08-29 22:14 UTCGHSA enrichment
  71. 2026-08-28 21:42 UTCEPSS rescore
  72. 2026-08-28 04:45 UTCGHSA enrichment
  73. 2026-08-28 00:57 UTCGHSA enrichment
  74. 2026-08-27 20:45 UTCEG score recompute
  75. 2026-08-27 20:45 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67305?
CVE-2026-67305 is a high vulnerability published on August 1, 2026. FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDRFILECONTENTS_RESPONSE PDUs without validating the server-provided size against the destination buffer. A malicious RDP server can send a response with a data…
When was CVE-2026-67305 disclosed?
CVE-2026-67305 was first published in the National Vulnerability Database on August 1, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67305 actively exploited?
CVE-2026-67305 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.4% of all scored CVEs.
What is the CVSS score of CVE-2026-67305?
CVE-2026-67305 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-67305?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67305, 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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