CVE-2026-55193

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 59% 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, FreeRDP clients using TS Gateway accept a server-controlled max_xmit_frag value in libfreerdp/core/gateway/rpc_bind.c without bounding it to the 4088-byte ReceiveFragment allocation. A malicious gateway can advertise 65535 and then send a response fragment of the same length, causing rpc_channel_read in libfreerdp/core/gateway/rpc.c to write up to 65535 bytes into the smaller ReceiveFragment buffer. This can crash the client and may permit code execution through attacker-controlled 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
41%
KEV
Not listed

Published

August 19, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
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 a863ef1cf1cd (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit a863ef1cf1cd — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/a863ef1cf1cdabf9019280e5658f806e73bb50e8
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 fragment receive due to uncapped bind_ack max_xmit_frag · Advisory · FreeRDP/FreeRDP · GitHub

Affected: 2.4.1) and from

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rp4-66mc-j9vx

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.26.04.1) @ resolute2026-09-20ubuntu
redhatfreerdp-2:3.10.3-12.el10_2.112026-09-10redhat
redhatfreerdp-2:2.11.7-7.el9_8.72026-09-10redhat

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 rangeFixed inDependents
freerdp22.10.0+dfsg1-1 ... 2.11.7+dfsg1-6~deb12u1 (13 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.31.0+dfsg-1 (44 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.26.0+dfsg-1~bpo13+1 (33 versions)3.27.0+dfsg-1—

Weakness Classification(1)

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

All Vendor Advisories

(3)

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 27× in last 7d / 100× 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 116 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-55193?
CVE-2026-55193 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 clients using TS Gateway accept a server-controlled maxxmitfrag value in libfreerdp/core/gateway/rpcbind.c without bounding it to the 4088-byte ReceiveFragment allocation. A malicious gateway can advertise…
When was CVE-2026-55193 disclosed?
CVE-2026-55193 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55193 actively exploited?
CVE-2026-55193 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 58.8% of all scored CVEs.
What is the CVSS score of CVE-2026-55193?
CVE-2026-55193 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-55193?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55193, 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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