CVE-2026-55827

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.5% (42nd percentile of EPSS-scored CVEs). 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
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.8Exploit: Elevated riskExposed services: Not assessed

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
8.8HIGHmedium 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
0.5%
EPSS %ILE
43rd
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

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.
githubMentions a patch (unverified)🟡 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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.26.04.1) @ resolute2026-10-01ubuntu
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 rangeFix by version rangeDependents
freerdp22.10.0+dfsg1-1 ... 2.9.0+dfsg1-1~bpo11+1 (32 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp22.10.0+dfsg1-1 ... 2.11.7+dfsg1-6~deb12u1 (13 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.32.1+dfsg-1~bpo13+1 (49 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.27.0+dfsg-1 (34 versions)
  • every version up to 3.27.1+dfsg-1: fixed in 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 7× in last 7d / 41× 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 196 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-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?
A fix for CVE-2026-55827 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55827 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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