CVE-2026-55827

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 73% 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, 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%CVSS: 8.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clients launched with the non-default /cache:codec:rfx option pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data while allocating bitmap->data only for the smaller DstWidth and DstHeight in gdi_Bitmap_Decompress, allowing a malicious RDP server to trigger a heap out-of-bounds write with attacker-controlled offset and content. This issue is fixed in version 3.27.1.

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
0%
EPSS %ILE
27%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 10, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_pr, github_release.
github Patch Available🟡 PoC Available

Heap out-of-bounds write in FreeRDP RemoteFX (RFX) Cache Bitmap V3 decode - malicious RDP server achieves controlled `$pc` in a connecting client · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prp
github_release Patch Available

3.27.1

Patch available: FreeRDP/FreeRDP 3.27.1

https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.1
github_pr

Bitmap decode

Fix merged in FreeRDP/FreeRDP PR #12899 on 2026-06-16 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/pull/12899
github_commit

commit e58adf922ea4 (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit e58adf922ea4 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0e3e

Vendor Advisories for CVE-2026-55827(2)

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) @ resolute2026-09-18ubuntu
redhatfreerdp-2:3.10.3-3.el10_0.102026-08-13redhat
redhatfreerdp-2:3.10.3-12.el10_2.72026-08-05redhat

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 ... 3.27.0+dfsg-1 (34 versions)3.27.1+dfsg-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

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 13× in last 7d / 63× 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 171 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-55827?
CVE-2026-55827 is a high vulnerability published on July 10, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clients launched with the non-default /cache:codec:rfx option pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data while allocating bitmap->data only for the smaller DstWidth and…
When was CVE-2026-55827 disclosed?
CVE-2026-55827 was first published in the National Vulnerability Database on July 10, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55827 actively exploited?
CVE-2026-55827 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 72.6% of all scored CVEs.
What is the CVSS score of CVE-2026-55827?
CVE-2026-55827 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-55827?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55827, 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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