CVE-2026-56297

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 80% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Elevated
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
28.7%
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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 44× 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. 2026-07-25 14:18 UTCEPSS rescore
  2. 2026-07-24 14:18 UTCEPSS rescore
  3. 2026-07-23 14:18 UTCEPSS rescore
  4. 2026-07-23 03:20 UTCEG score recompute▲ 1.10
  5. 2026-07-22 14:08 UTCEPSS rescore
  6. 2026-07-21 15:25 UTCEPSS rescore
  7. 2026-07-20 17:08 UTCEPSS rescore
  8. 2026-07-19 14:31 UTCEPSS rescore
  9. 2026-07-19 14:31 UTCEPSS rescore
  10. 2026-07-19 02:29 UTCEPSS rescore
  11. 2026-07-18 10:04 UTCEPSS rescore
  12. 2026-07-16 22:40 UTCGHSA enrichment
  13. 2026-07-16 17:03 UTCEPSS rescore
  14. 2026-07-16 10:53 UTCGHSA enrichment
  15. 2026-07-15 23:05 UTCGHSA enrichment
  16. 2026-07-15 16:57 UTCEPSS rescore
  17. 2026-07-15 16:57 UTCEPSS rescore
  18. 2026-07-15 11:17 UTCGHSA enrichment
  19. 2026-07-15 02:00 UTCEPSS rescore
  20. 2026-07-15 02:00 UTCEPSS rescore
  21. 2026-07-14 23:28 UTCGHSA enrichment
  22. 2026-07-14 11:41 UTCGHSA enrichment
  23. 2026-07-13 23:53 UTCGHSA enrichment
  24. 2026-07-13 22:31 UTCEPSS rescore
  25. 2026-07-13 12:05 UTCGHSA enrichment
Show 19 more
  1. 2026-07-13 06:13 UTCEPSS rescore
  2. 2026-07-13 06:13 UTCEPSS rescore
  3. 2026-07-13 00:17 UTCGHSA enrichment
  4. 2026-07-12 12:29 UTCGHSA enrichment
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-12 00:41 UTCGHSA enrichment
  7. 2026-07-11 12:53 UTCGHSA enrichment
  8. 2026-07-11 08:27 UTCEPSS rescore
  9. 2026-07-11 08:27 UTCEPSS rescore
  10. 2026-07-11 01:06 UTCGHSA enrichment
  11. 2026-07-10 16:18 UTCNVD updateCVSS v3 → 8.1
  12. 2026-07-10 13:17 UTCGHSA enrichment
  13. 2026-07-10 01:29 UTCGHSA enrichment
  14. 2026-07-09 19:10 UTCEPSS rescore
  15. 2026-07-09 19:10 UTCEPSS rescore
  16. 2026-07-09 13:41 UTCGHSA enrichment
  17. 2026-07-09 01:53 UTCGHSA enrichment
  18. 2026-07-08 14:06 UTCEG score recompute
  19. 2026-07-08 14:05 UTCMITRE cvelistV5first tracked

Related CVEs(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 28.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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