CVE-2026-56297

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: Elevated riskExposed: 0

A fix is available — apply it.

FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 10, 2026

Advisory Details (2)

Auto-updated Jul 8, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callback | Advisories | VulnCheck

https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback
github Patch Available🟡 PoC Available

Use After Free and Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in FreeRDP · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h

Vendor Advisories for CVE-2026-56297(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.26.04.1) @ resolute2026-08-30ubuntu

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
freerdp22.10.0+dfsg1-1 ... 2.9.0+dfsg1-1~bpo11+1 (32 versions)——
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 ... 3.30.0+dfsg-1~bpo13+1 (43 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.22.0+dfsg-1~bpo13+1 (17 versions)3.22.0+dfsg-1—

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 26× in last 7d / 158× 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 224 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-56297?
CVE-2026-56297 is a high vulnerability published on July 8, 2026. FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcmanchannelclose and dvcmancallonreceive due to improper synchronization of channelcallback access. A malicious RDP server can trigger a race condition by sending DYNVCDATA and DYNVCCLOSE messages concurrently, causing…
When was CVE-2026-56297 disclosed?
CVE-2026-56297 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56297 actively exploited?
CVE-2026-56297 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 71.1% of all scored CVEs.
What is the CVSS score of CVE-2026-56297?
CVE-2026-56297 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-56297?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56297, 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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