CVE-2026-44421

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: 0.5%, top 58% 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: 1%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 server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. 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
1%
EPSS %ILE
42%
KEV
Not listed

Published

May 29, 2026

Last Modified

July 27, 2026

Advisory Details (1)

Auto-updated Jun 2, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

FreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff

Vendor Advisories for CVE-2026-44421(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 / 34× 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 194 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 16:47 UTCEPSS rescore
  8. 2026-09-13 01:06 UTCOSV refresh
  9. 2026-09-12 15:01 UTCEPSS rescore
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 09:37 UTCEPSS rescore
  12. 2026-09-10 09:34 UTCEPSS rescore
  13. 2026-09-08 22:00 UTCEPSS rescore
  14. 2026-09-07 16:01 UTCEPSS rescore
  15. 2026-09-06 13:47 UTCEPSS rescore
  16. 2026-09-04 05:06 UTCEPSS rescore
  17. 2026-09-02 14:12 UTCEPSS rescore
  18. 2026-09-01 13:54 UTCEPSS rescore
  19. 2026-08-30 19:17 UTCEPSS rescore
  20. 2026-08-30 01:22 UTCEPSS rescore
  21. 2026-08-28 21:41 UTCEPSS rescore
  22. 2026-08-27 14:25 UTCEPSS rescore
  23. 2026-08-26 14:46 UTCEPSS rescore
  24. 2026-08-25 13:49 UTCEPSS rescore
  25. 2026-08-25 04:17 UTCEG score recompute
Show 75 more
  1. 2026-08-25 04:17 UTCVendor advisory
  2. 2026-08-23 14:11 UTCEG score recompute
  3. 2026-08-23 14:11 UTCVendor advisory
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-21 14:59 UTCEG score recompute
  7. 2026-08-21 14:59 UTCVendor advisory
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-20 21:50 UTCVendor advisory
  10. 2026-08-20 10:24 UTCEG score recompute
  11. 2026-08-20 10:24 UTCVendor advisory
  12. 2026-08-19 17:04 UTCEPSS rescore
  13. 2026-08-18 13:48 UTCEPSS rescore
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 06:51 UTCEG score recompute
  16. 2026-08-17 06:51 UTCVendor advisory
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 06:05 UTCEG score recompute
  19. 2026-08-16 06:05 UTCVendor advisory
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 18:41 UTCEG score recompute
  22. 2026-08-15 18:41 UTCVendor advisory
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 23:18 UTCVendor advisory
  25. 2026-08-14 11:52 UTCVendor advisory
  26. 2026-08-14 00:27 UTCEG score recompute
  27. 2026-08-14 00:27 UTCVendor advisory
  28. 2026-08-13 22:00 UTCEPSS rescore
  29. 2026-08-13 08:54 UTCVendor advisory
  30. 2026-08-12 21:29 UTCEG score recompute
  31. 2026-08-12 21:29 UTCVendor advisory
  32. 2026-08-12 13:51 UTCEPSS rescore
  33. 2026-08-12 10:05 UTCVendor advisory
  34. 2026-08-11 22:35 UTCEG score recompute
  35. 2026-08-11 22:35 UTCVendor advisory
  36. 2026-08-11 13:43 UTCEPSS rescore
  37. 2026-08-11 11:10 UTCEG score recompute
  38. 2026-08-11 11:10 UTCVendor advisory
  39. 2026-08-11 00:00 UTCEPSS rescore
  40. 2026-08-10 23:43 UTCVendor advisory
  41. 2026-08-10 04:18 UTCVendor advisory
  42. 2026-08-09 16:53 UTCEG score recompute
  43. 2026-08-09 16:53 UTCVendor advisory
  44. 2026-08-09 13:46 UTCEPSS rescore
  45. 2026-08-09 05:28 UTCVendor advisory
  46. 2026-08-08 18:03 UTCEG score recompute
  47. 2026-08-08 18:03 UTCVendor advisory
  48. 2026-08-08 16:37 UTCEPSS rescore
  49. 2026-08-08 06:09 UTCVendor advisory
  50. 2026-08-07 18:44 UTCEG score recompute
  51. 2026-08-07 18:44 UTCVendor advisory
  52. 2026-08-07 07:05 UTCVendor advisory
  53. 2026-08-06 19:40 UTCEG score recompute
  54. 2026-08-06 19:40 UTCVendor advisory
  55. 2026-08-06 13:46 UTCEPSS rescore
  56. 2026-08-06 08:15 UTCVendor advisory
  57. 2026-08-05 20:42 UTCEG score recompute
  58. 2026-08-05 20:42 UTCVendor advisory
  59. 2026-08-05 19:17 UTCEPSS rescore
  60. 2026-08-04 23:05 UTCEG score recompute
  61. 2026-08-04 23:05 UTCVendor advisory
  62. 2026-08-04 15:10 UTCEPSS rescore
  63. 2026-08-04 10:38 UTCEPSS rescore
  64. 2026-08-04 03:22 UTCVendor advisory
  65. 2026-08-03 15:55 UTCEG score recompute
  66. 2026-08-03 15:55 UTCVendor advisory
  67. 2026-08-03 10:36 UTCEPSS rescore
  68. 2026-08-03 00:26 UTCVendor advisory
  69. 2026-08-02 12:46 UTCEG score recompute
  70. 2026-08-02 12:46 UTCVendor advisory
  71. 2026-08-02 02:27 UTCEPSS rescore
  72. 2026-08-02 01:21 UTCVendor advisory
  73. 2026-08-01 13:55 UTCEG score recompute
  74. 2026-08-01 13:55 UTCVendor advisory
  75. 2026-08-01 04:16 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-44421?
CVE-2026-44421 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 server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdiCacheToSurface: it validates a destination rectangle that is clamped to UINT16MAX,…
When was CVE-2026-44421 disclosed?
CVE-2026-44421 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-2026-44421 actively exploited?
CVE-2026-44421 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 57.7% of all scored CVEs.
What is the CVSS score of CVE-2026-44421?
CVE-2026-44421 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-44421?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44421, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-44421

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