CVE-2026-55192

HIGHNVD 8.28.2
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.4% (37th 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
8.2EG
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: 0.4%CVSS: 8.2Exploit: 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 3.27.0, FreeRDP H.264 decoder backends can return YUV planes sized from the bitstream without comparing the decoded width and height to the RDPGFX surface dimensions used to validate region rectangles. A malicious RDP server can provide an AVC420 or AVC444 bitstream whose decoded frame is smaller than the negotiated surface, causing yuv420_context_decode and the YUV-to-RGB conversion paths to read beyond the decoder-owned planes in libfreerdp/codec/h264.c and the selected H.264 backend. This can disclose client memory or crash the client. This issue is fixed in version 3.27.0.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
68
EG Risk 68/100

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 (value × EchelonGraph’s weight)
Severity82% × 45%
The EG Score, 8.2 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (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 yes (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
0.4%
EPSS %ILE
37th
KEV
Not listed

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 yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

August 19, 2026

Last Modified

September 22, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
GitHub advisoryMentions a patch (unverified)

Out-of-bounds read in H.264 YUV-to-RGB conversion due to decoder/surface dimension mismatch · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mmf-qh4f-frm6
GitHub release Patch Available

3.27.0

Patch available: FreeRDP/FreeRDP 3.27.0

https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0
GitHub pull request

Bounds fixes

Fix merged in FreeRDP/FreeRDP PR #12873 on 2026-06-11 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/pull/12873
GitHub commit

commit 0cd45b70bb1f (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 0cd45b70bb1f — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/0cd45b70bb1fe6befd258ff64c46461947e99adb

Vendor Advisories for CVE-2026-55192(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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.26.04.1) @ resolute2026-10-08ubuntu
redhatfreerdp-2:3.10.3-3.el10_0.162026-09-17redhat
redhatfreerdp-0:2.1.1-5.el7_9.122026-09-17redhat

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

(3 across 3 ecosystems)
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 ... 3.31.1+dfsg-1~bpo13+1 (46 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.26.0+dfsg-1~bpo13+1 (33 versions)
  • every version up to 3.27.0+dfsg-1: fixed in 3.27.0+dfsg-1
—

Weakness Classification(1)

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 13× in last 7d / 93× 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 184 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 84 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  11. 2026-10-08 07:41 UTCEG score recompute
  12. 2026-10-08 07:41 UTCVendor advisory
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  14. 2026-10-07 07:38 UTCVendor advisory
  15. 2026-10-06 19:46 UTCEG score recompute
  16. 2026-10-06 19:46 UTCVendor advisory
  17. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  18. 2026-10-06 07:57 UTCEG score recompute
  19. 2026-10-06 07:57 UTCVendor advisory
  20. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  21. 2026-10-05 09:32 UTCEG score recompute
  22. 2026-10-05 09:32 UTCVendor advisory
  23. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-10-04 21:24 UTCVendor advisory
  25. 2026-10-04 05:08 UTCVendor advisory
Show 75 more
  1. 2026-10-03 16:55 UTCEG score recompute
  2. 2026-10-03 16:55 UTCVendor advisory
  3. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  4. 2026-10-03 00:42 UTCEG score recompute
  5. 2026-10-03 00:42 UTCVendor advisory
  6. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  7. 2026-10-02 11:07 UTCVendor advisory
  8. 2026-10-01 22:46 UTCEG score recompute
  9. 2026-10-01 22:46 UTCVendor advisory
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-01 08:26 UTCVendor advisory
  12. 2026-09-30 20:35 UTCEG score recompute
  13. 2026-09-30 20:35 UTCVendor advisory
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  15. 2026-09-30 08:43 UTCEG score recompute
  16. 2026-09-30 08:43 UTCVendor advisory
  17. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  18. 2026-09-28 21:42 UTCEG score recompute
  19. 2026-09-28 21:42 UTCVendor advisory
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  21. 2026-09-28 06:31 UTCVendor advisory
  22. 2026-09-27 18:43 UTCEG score recompute
  23. 2026-09-27 18:43 UTCVendor advisory
  24. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  25. 2026-09-27 06:55 UTCEG score recompute
  26. 2026-09-27 06:55 UTCVendor advisory
  27. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  28. 2026-09-25 07:34 UTCVendor advisory
  29. 2026-09-24 19:45 UTCEG score recompute
  30. 2026-09-24 19:45 UTCVendor advisory
  31. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  32. 2026-09-24 07:57 UTCVendor advisory
  33. 2026-09-23 20:09 UTCEG score recompute
  34. 2026-09-23 20:09 UTCVendor advisory
  35. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  36. 2026-09-23 07:43 UTCVendor advisory
  37. 2026-09-22 19:55 UTCEG score recompute▲ 1.00
  38. 2026-09-22 19:55 UTCVendor advisory
  39. 2026-09-22 19:51 UTCNVD updateCVSS v3 → 8.2
  40. 2026-09-22 09:22 UTCVendor advisory
  41. 2026-09-21 21:31 UTCEG score recompute
  42. 2026-09-21 21:31 UTCVendor advisory
  43. 2026-09-21 09:34 UTCVendor advisory
  44. 2026-09-20 21:46 UTCEG score recompute
  45. 2026-09-20 21:46 UTCVendor advisory
  46. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  47. 2026-09-20 09:56 UTCVendor advisory
  48. 2026-09-19 22:08 UTCEG score recompute
  49. 2026-09-19 22:08 UTCVendor advisory
  50. 2026-09-19 10:14 UTCVendor advisory
  51. 2026-09-18 21:44 UTCEG score recompute
  52. 2026-09-18 21:44 UTCVendor advisory
  53. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  54. 2026-09-18 09:25 UTCVendor advisory
  55. 2026-09-17 21:29 UTCEG score recompute
  56. 2026-09-17 21:29 UTCVendor advisory
  57. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  58. 2026-09-17 09:36 UTCVendor advisory
  59. 2026-09-16 21:47 UTCEG score recompute
  60. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  61. 2026-09-16 09:49 UTCEG score recompute
  62. 2026-09-16 09:49 UTCVendor advisory
  63. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  64. 2026-09-15 21:10 UTCVendor advisory
  65. 2026-09-15 08:33 UTCEG score recompute
  66. 2026-09-15 08:33 UTCVendor advisory
  67. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  68. 2026-09-14 20:44 UTCVendor advisory
  69. 2026-09-14 08:55 UTCVendor advisory
  70. 2026-09-13 21:07 UTCEG score recompute
  71. 2026-09-13 21:07 UTCVendor advisory
  72. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  73. 2026-09-13 09:18 UTCVendor advisory
  74. 2026-09-12 21:30 UTCEG score recompute
  75. 2026-09-12 21:30 UTCVendor advisory

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-55192?
CVE-2026-55192 is a high-severity vulnerability; its CVE record was published on August 19, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP H.264 decoder backends can return YUV planes sized from the bitstream without comparing the decoded width and height to the RDPGFX surface dimensions used to validate region rectangles. A malicious RDP server…
When was the CVE record for CVE-2026-55192 published?
The CVE record for CVE-2026-55192 was published on August 19, 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 September 22, 2026; the record at its source may have been updated since.
Is CVE-2026-55192 actively exploited?
CVE-2026-55192 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55192?
CVE-2026-55192 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-55192?
A fix for CVE-2026-55192 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55192 are linked in the Vendor Advisories panel on this page.

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