CVE-2026-55827

HIGHNVD 8.88.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.5% (45th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-43004 (ENISA EUVD)Source: ENISA EUVD

8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.8Exploit: No code on recordExposed 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 56/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
45th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.

EG Severity
8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 10, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 10, 2026
Patch available. Sources: github, github_commit, github_pr, github_release.
GitHub advisoryMentions a patch (unverified)

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 pull request

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) @ resolute2026-11-01ubuntu
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 9× in last 7d / 42× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 231 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 131 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  2. 2026-11-01 09:15 UTCEG score recompute
  3. 2026-11-01 09:15 UTCVendor advisory
  4. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  7. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  10. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-10-25 14:18 UTCEG score recompute
  12. 2026-10-24 18:15 UTCEG score recompute
  13. 2026-10-24 18:15 UTCVendor advisory
  14. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  15. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  16. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-10-18 03:29 UTCEG score recompute
  22. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-10-17 03:14 UTCEG score recompute
  24. 2026-10-17 03:14 UTCVendor advisory
  25. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
Show 75 more
  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-12 15:55 UTCEG score recompute
  6. 2026-10-11 19:38 UTCEG score recompute
  7. 2026-10-11 16:53 UTCEG score recompute
  8. 2026-10-11 14:16 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-10-01 14:58 UTCEG score recompute
  21. 2026-10-01 14:58 UTCVendor advisory
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  25. 2026-09-28 09:46 UTCEG score recompute
  26. 2026-09-28 09:46 UTCVendor advisory
  27. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  28. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  29. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  30. 2026-09-24 11:09 UTCEG score recompute
  31. 2026-09-24 11:09 UTCVendor advisory
  32. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  33. 2026-09-23 05:44 UTCEG score recompute
  34. 2026-09-23 05:44 UTCVendor advisory
  35. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  36. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  37. 2026-09-18 05:17 UTCEG score recompute
  38. 2026-09-18 05:17 UTCVendor advisory
  39. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  40. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  41. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  42. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  43. 2026-09-13 23:39 UTCEG score recompute
  44. 2026-09-13 23:39 UTCVendor advisory
  45. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  46. 2026-09-13 08:11 UTCVendor advisory
  47. 2026-09-12 15:53 UTCEG score recompute
  48. 2026-09-12 15:53 UTCVendor advisory
  49. 2026-09-12 02:50 UTCEG score recompute
  50. 2026-09-12 02:50 UTCVendor advisory
  51. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  52. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  53. 2026-09-08 02:46 UTCEG score recompute
  54. 2026-09-08 02:46 UTCVendor advisory
  55. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  56. 2026-09-06 13:57 UTCEG score recompute
  57. 2026-09-06 13:57 UTCVendor advisory
  58. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  59. 2026-09-05 21:41 UTCEG score recompute
  60. 2026-09-05 21:41 UTCVendor advisory
  61. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  62. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  63. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  64. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  65. 2026-08-30 19:18 UTCEG score recompute
  66. 2026-08-30 19:18 UTCVendor advisory
  67. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  68. 2026-08-30 06:16 UTCEG score recompute
  69. 2026-08-30 06:16 UTCVendor advisory
  70. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  71. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  72. 2026-08-27 21:40 UTCEG score recompute
  73. 2026-08-27 21:40 UTCVendor advisory
  74. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  75. 2026-08-27 00:46 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-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-55827 published?
The CVE record for CVE-2026-55827 was published on July 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 15, 2026; the record at its source may have been updated since.
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 (45th 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.

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