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: 0.8%CVSS: 8.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
8.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
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
0.8%
EPSS %ILE
53rd
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

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

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 17× in last 7d / 92× 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 349 total refreshes for this CVE.

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

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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 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 0.8% probability of exploitation in the next 30 days (53rd percentile of EPSS-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?
A fix for CVE-2026-67305 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-67305 are linked in the Vendor Advisories panel on this page.

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