CVE-2026-55192

HIGHPre-NVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 67% 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, secondary
Trending — 3 sources updated this weekElevated
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.2Exploit: Elevated riskExposed: 0

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
7.2
EG Score
7.2(medium)
EG Risk
63(Attend)
EG Risk 63/100SSVC: Attend

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
Severity72% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 25, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available🟡 PoC Available

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_pr

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.24.04.1) @ noble2026-08-29ubuntu

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.

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 24× 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.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 19:25 UTCVendor advisory
  3. 2026-08-29 07:29 UTCEG score recompute
  4. 2026-08-29 07:29 UTCVendor advisory
  5. 2026-08-28 21:41 UTCEPSS rescore
  6. 2026-08-28 19:33 UTCVendor advisory
  7. 2026-08-28 03:55 UTCVendor advisory
  8. 2026-08-27 16:03 UTCEG score recompute
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 04:11 UTCVendor advisory
  11. 2026-08-26 16:14 UTCEG score recompute
  12. 2026-08-26 16:14 UTCVendor advisory
  13. 2026-08-26 14:46 UTCEPSS rescore
  14. 2026-08-25 16:12 UTCEG score recompute
  15. 2026-08-25 16:12 UTCVendor advisory
  16. 2026-08-25 13:49 UTCEPSS rescore
  17. 2026-08-25 04:24 UTCEG score recompute
  18. 2026-08-25 04:24 UTCVendor advisory
  19. 2026-08-25 03:50 UTCEG score recompute
  20. 2026-08-25 03:50 UTCVendor advisory
  21. 2026-08-24 17:02 UTCEG score recompute
  22. 2026-08-24 17:02 UTCVendor advisory
  23. 2026-08-24 04:34 UTCVendor advisory
  24. 2026-08-23 16:45 UTCVendor advisory
  25. 2026-08-23 04:56 UTCEG score recompute
Show 16 more
  1. 2026-08-23 04:56 UTCVendor advisory
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-22 17:08 UTCVendor advisory
  4. 2026-08-22 05:20 UTCEG score recompute
  5. 2026-08-22 05:20 UTCVendor advisory
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-21 17:31 UTCVendor advisory
  8. 2026-08-21 05:43 UTCEG score recompute
  9. 2026-08-21 05:43 UTCVendor advisory
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-20 17:55 UTCVendor advisory
  12. 2026-08-20 06:07 UTCVendor advisory
  13. 2026-08-19 18:18 UTCEG score recompute
  14. 2026-08-19 18:18 UTCVendor advisory
  15. 2026-08-19 18:04 UTCEG score recompute
  16. 2026-08-19 18:02 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55192?
CVE-2026-55192 is a high vulnerability 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 CVE-2026-55192 disclosed?
CVE-2026-55192 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55192 actively exploited?
CVE-2026-55192 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 67.2% of all scored CVEs.
What is the CVSS score of CVE-2026-55192?
CVE-2026-55192 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-55192?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55192, 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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