CVE-2026-55194

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 62% 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
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: Elevated riskExposed: 0

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, rpc_client_recv_fragment in libfreerdp/core/gateway/rpc_client.c ensures the response reassembly stream capacity using only the server-declared alloc_hint rather than the actual StubLength about to be written. A malicious TS Gateway can send a PTYPE_RESPONSE with a small alloc_hint and a much larger frag_length, causing Stream_Write to copy attacker-controlled stub data beyond the 4096-byte pdu->s buffer. This can crash the client and may permit code execution through heap corruption. This issue is fixed in version 3.27.0.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
55(Track*)
EG Risk 55/100SSVC: 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
Severity87% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 27, 2026

Advisory Details (4)

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

commit 9f2da52c2341 (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 9f2da52c2341 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/9f2da52c2341cc14a96ad12e69c5b83d0bcd8b5a
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 Patch Available🟡 PoC Available

Heap-buffer-overflow write in TS Gateway RPC RESPONSE reassembly due to alloc_hint capacity mismatch · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9gxm-3mf5-f5cx

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.26.04.1) @ resolute2026-08-29ubuntu

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 22× 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 20:21 UTCVendor advisory
  3. 2026-08-29 08:00 UTCEG score recompute
  4. 2026-08-29 08:00 UTCVendor advisory
  5. 2026-08-28 21:41 UTCEPSS rescore
  6. 2026-08-28 19:33 UTCVendor advisory
  7. 2026-08-28 05:48 UTCVendor advisory
  8. 2026-08-27 17:24 UTCEG score recompute
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 09:09 UTCVendor advisory
  11. 2026-08-26 20:47 UTCEG score recompute
  12. 2026-08-26 20:47 UTCVendor advisory
  13. 2026-08-26 14:46 UTCEPSS rescore
  14. 2026-08-26 08:11 UTCVendor advisory
  15. 2026-08-25 19:49 UTCEG score recompute
  16. 2026-08-25 19:49 UTCVendor advisory
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 07:28 UTCVendor advisory
  19. 2026-08-24 19:07 UTCEG score recompute
  20. 2026-08-24 19:07 UTCVendor advisory
  21. 2026-08-24 06:46 UTCVendor advisory
  22. 2026-08-23 18:24 UTCVendor advisory
  23. 2026-08-23 06:03 UTCEG score recompute
  24. 2026-08-23 06:03 UTCVendor advisory
  25. 2026-08-23 00:19 UTCEPSS rescore
Show 16 more
  1. 2026-08-22 17:42 UTCVendor advisory
  2. 2026-08-22 05:18 UTCEG score recompute
  3. 2026-08-22 05:18 UTCVendor advisory
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-21 16:57 UTCVendor advisory
  6. 2026-08-21 04:36 UTCEG score recompute
  7. 2026-08-21 04:36 UTCVendor advisory
  8. 2026-08-21 04:01 UTCEG score recompute
  9. 2026-08-21 04:01 UTCVendor advisory
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-20 19:01 UTCVendor advisory
  12. 2026-08-20 06:40 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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-55194?
CVE-2026-55194 is a high vulnerability published on August 19, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, rpcclientrecvfragment in libfreerdp/core/gateway/rpcclient.c ensures the response reassembly stream capacity using only the server-declared allochint rather than the actual StubLength about to be written. A malicious…
When was CVE-2026-55194 disclosed?
CVE-2026-55194 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55194 actively exploited?
CVE-2026-55194 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 62.0% of all scored CVEs.
What is the CVSS score of CVE-2026-55194?
CVE-2026-55194 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-55194?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55194, 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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