CVE-2026-55193

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: 0.4% (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
8.8EG
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: 0.4%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 3.27.0, 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
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100

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)
Severity88% × 45%
The EG Score, 8.8 of 10.
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
0.4%
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 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.

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

August 19, 2026

Last Modified

September 29, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
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 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 advisoryMentions a patch (unverified)

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

Vendor Advisories for CVE-2026-55193(11)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.26.04.1) @ resolute2026-10-08ubuntu
redhatfreerdp-0:2.1.1-5.el7_9.132026-10-02redhat
redhatfreerdp-2:3.10.3-3.el10_0.182026-10-01redhat
redhatfreerdp-2:2.4.1-6.el9_2.132026-10-01redhat
redhatfreerdp-2:2.2.0-7.el8_6.132026-09-29redhat
redhatfreerdp-2:2.2.0-12.el8_8.122026-09-29redhat
redhatfreerdp-2:2.2.0-14.el8_4.42026-09-29redhat
redhatfreerdp-2:2.11.7-1.el9_6.142026-09-28redhat
redhatfreerdp-2:2.11.2-1.el9_4.122026-09-28redhat
redhatfreerdp-2:2.11.7-13.el8_102026-09-21redhat
redhatfreerdp-2:2.11.7-7.el9_8.72026-09-10redhat
redhatfreerdp-2:3.10.3-12.el10_2.112026-09-10redhat

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 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 ... 3.26.0+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

(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 13× in last 7d / 95× 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 185 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 85 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% · 36th 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% · 36th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-08 07:44 UTCEG score recompute
  12. 2026-10-08 07:44 UTCVendor advisory
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  14. 2026-10-07 07:33 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. 2026-10-02 22:13 UTCEG score recompute
  5. 2026-10-02 22:13 UTCVendor advisory
  6. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  7. 2026-10-02 10:29 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 08:18 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 UTCVendor advisory
  16. 2026-09-29 19:13 UTCEG score recompute▲ 0.10
  17. 2026-09-29 19:13 UTCVendor advisory
  18. 2026-09-29 19:06 UTCNVD updateCVSS v3 → 8.8
  19. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-09-28 21:42 UTCEG score recompute
  21. 2026-09-28 21:42 UTCVendor advisory
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  23. 2026-09-28 06:21 UTCVendor advisory
  24. 2026-09-27 18:38 UTCEG score recompute
  25. 2026-09-27 18:38 UTCVendor advisory
  26. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  27. 2026-09-27 06:55 UTCEG score recompute
  28. 2026-09-27 06:55 UTCVendor advisory
  29. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  30. 2026-09-25 07:27 UTCVendor advisory
  31. 2026-09-24 19:44 UTCEG score recompute
  32. 2026-09-24 19:44 UTCVendor advisory
  33. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  34. 2026-09-24 07:52 UTCVendor advisory
  35. 2026-09-23 20:09 UTCEG score recompute
  36. 2026-09-23 20:09 UTCVendor advisory
  37. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  38. 2026-09-23 08:01 UTCVendor advisory
  39. 2026-09-22 20:18 UTCEG score recompute
  40. 2026-09-22 20:18 UTCVendor advisory
  41. 2026-09-22 08:33 UTCEG score recompute
  42. 2026-09-22 08:33 UTCVendor advisory
  43. 2026-09-21 20:50 UTCVendor advisory
  44. 2026-09-21 09:07 UTCVendor advisory
  45. 2026-09-20 21:24 UTCEG score recompute
  46. 2026-09-20 21:24 UTCVendor advisory
  47. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  48. 2026-09-20 09:41 UTCVendor advisory
  49. 2026-09-19 21:57 UTCEG score recompute
  50. 2026-09-19 21:57 UTCVendor advisory
  51. 2026-09-19 10:14 UTCVendor advisory
  52. 2026-09-18 21:44 UTCEG score recompute
  53. 2026-09-18 21:44 UTCVendor advisory
  54. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  55. 2026-09-18 09:12 UTCVendor advisory
  56. 2026-09-17 21:29 UTCEG score recompute
  57. 2026-09-17 21:29 UTCVendor advisory
  58. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  59. 2026-09-17 07:49 UTCVendor advisory
  60. 2026-09-16 20:06 UTCEG score recompute
  61. 2026-09-16 20:06 UTCVendor advisory
  62. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  63. 2026-09-16 06:58 UTCEG score recompute
  64. 2026-09-16 06:58 UTCVendor advisory
  65. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  66. 2026-09-15 19:15 UTCVendor advisory
  67. 2026-09-15 07:31 UTCEG score recompute
  68. 2026-09-15 07:31 UTCVendor advisory
  69. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  70. 2026-09-14 19:47 UTCVendor advisory
  71. 2026-09-14 08:04 UTCVendor advisory
  72. 2026-09-13 20:21 UTCEG score recompute
  73. 2026-09-13 20:21 UTCVendor advisory
  74. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  75. 2026-09-13 08:38 UTCVendor advisory

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Frequently asked(5)

What is CVE-2026-55193?
CVE-2026-55193 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 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 the CVE record for CVE-2026-55193 published?
The CVE record for CVE-2026-55193 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 29, 2026; the record at its source may have been updated since.
Is CVE-2026-55193 actively exploited?
CVE-2026-55193 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-2026-55193?
CVE-2026-55193 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-55193?
A fix for CVE-2026-55193 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55193 are linked in the Vendor Advisories panel on this page.

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