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 74% 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
26%
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) @ resolute2026-08-26ubuntu
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 ... 3.30.0+dfsg-1~bpo13+1 (43 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 25× in last 7d / 97× 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 129 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 73.6% 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-55827

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