CVE-2026-44420

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 3.7%, top 11% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 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: 4%CVSS: 8.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySetLength. This can crash the server process (remote DoS) and may be exploitable for code execution because it corrupts heap memory. This vulnerability is fixed in 3.26.0.

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
4%
EPSS %ILE
89%
KEV
Not listed

Published

May 29, 2026

Last Modified

July 27, 2026

Advisory Details (1)

Auto-updated May 31, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mvpx-xj7r-3p3r

Vendor Advisories for CVE-2026-44420(1)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.26.04.1) @ resolute2026-09-14ubuntu
redhatfreerdp-2:3.10.3-3.el10_0.92026-07-27redhat
redhatfreerdp-2:3.10.3-12.el10_2.62026-07-07redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
freerdp22.10.0+dfsg1-1 ... 2.9.0+dfsg1-1~bpo11+1 (32 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
freerdp22.10.0+dfsg1-1 ... 2.11.7+dfsg1-6~deb12u1 (13 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.31.0+dfsg-1 (44 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.26.0+dfsg-1~bpo13+1 (32 versions)3.26.0+dfsg-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 33× 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 189 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-44420?
CVE-2026-44420 is a high vulnerability published on May 29, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CBCLIPCAPS PDU with a too-small capabilitySetLength. This can crash the server process…
When was CVE-2026-44420 disclosed?
CVE-2026-44420 was first published in the National Vulnerability Database on May 29, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44420 actively exploited?
CVE-2026-44420 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 10.9% of all scored CVEs.
What is the CVSS score of CVE-2026-44420?
CVE-2026-44420 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-44420?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44420, 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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