CVE-2026-63652

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.6% (46th percentile of EPSS-scored CVEs). 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, nvd
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, rdpsnd_server_recv_formats in channels/rdpsnd/server/rdpsnd_main.c frees context->client_formats on a malformed Client Audio Formats PDU without clearing the owning pointer or num_client_formats. An authenticated RDP client can trigger an error such as a cbSize larger than the remaining record, leave the dangling pointer in the server context, and cause rdpsnd_server_context_free to free the same allocation again at session teardown. This reliably terminates the server and can create allocator-dependent heap corruption. This issue is fixed in version 3.28.0.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
34
EG Risk 34/100CISA SSVC

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
Severity65% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
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
0.6%
EPSS %ILE
46th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 19, 2026

Last Modified

September 22, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
githubMentions a patch (unverified)🟡 PoC Available

Double-free of `client_formats` in the rdpsnd server channel on a malformed Client Audio Formats PDU · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9g22-w2gr-vcmp
github_release Patch Available

3.28.0

Patch available: FreeRDP/FreeRDP 3.28.0

https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0
github_pr

Range checks

Fix merged in FreeRDP/FreeRDP PR #12993 on 2026-07-02 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/pull/12993
github_commit

commit caf653c0ba1c (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit caf653c0ba1c — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/caf653c0ba1c75ec8f298d1baa59770102a5d14c

Vendor Advisories for CVE-2026-63652(2)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatfreerdp-2:3.10.3-3.el10_0.162026-09-17redhat
redhatfreerdp-2:3.10.3-12.el10_2.102026-08-31redhat

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 ... 3.31.1+dfsg-1~bpo13+1 (46 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.27.1+dfsg-1 (35 versions)
  • every version up to 3.28.0+dfsg-1: fixed in 3.28.0+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 87× 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 144 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
  4. 2026-10-08 07:40 UTCEG score recompute
  5. 2026-10-08 07:40 UTCVendor advisory
  6. 2026-10-07 23:48 UTCEPSS rescore
  7. 2026-10-07 05:58 UTCEG score recompute
  8. 2026-10-07 05:58 UTCVendor advisory
  9. 2026-10-06 15:18 UTCEPSS rescore
  10. 2026-10-06 07:57 UTCEG score recompute
  11. 2026-10-06 07:57 UTCVendor advisory
  12. 2026-10-05 17:43 UTCEPSS rescore
  13. 2026-10-05 01:45 UTCEG score recompute
  14. 2026-10-05 01:45 UTCVendor advisory
  15. 2026-10-04 23:22 UTCEPSS rescore
  16. 2026-10-04 03:12 UTCEG score recompute
  17. 2026-10-04 03:12 UTCVendor advisory
  18. 2026-10-03 14:26 UTCEPSS rescore
  19. 2026-10-03 05:14 UTCEG score recompute
  20. 2026-10-03 05:14 UTCVendor advisory
  21. 2026-10-02 17:56 UTCEPSS rescore
  22. 2026-10-02 06:51 UTCEG score recompute
  23. 2026-10-02 06:51 UTCVendor advisory
  24. 2026-10-01 19:50 UTCEPSS rescore
  25. 2026-10-01 06:42 UTCEG score recompute
Show 75 more
  1. 2026-10-01 06:42 UTCVendor advisory
  2. 2026-09-30 15:03 UTCEPSS rescore
  3. 2026-09-30 08:43 UTCEG score recompute
  4. 2026-09-30 08:43 UTCVendor advisory
  5. 2026-09-29 02:52 UTCEG score recompute
  6. 2026-09-29 02:52 UTCVendor advisory
  7. 2026-09-28 13:51 UTCEPSS rescore
  8. 2026-09-28 04:53 UTCEG score recompute
  9. 2026-09-28 04:53 UTCVendor advisory
  10. 2026-09-27 06:54 UTCEG score recompute
  11. 2026-09-27 06:54 UTCVendor advisory
  12. 2026-09-26 15:59 UTCEPSS rescore
  13. 2026-09-25 03:56 UTCEG score recompute
  14. 2026-09-25 03:56 UTCVendor advisory
  15. 2026-09-24 05:57 UTCEG score recompute
  16. 2026-09-24 05:57 UTCVendor advisory
  17. 2026-09-23 17:54 UTCEPSS rescore
  18. 2026-09-23 07:58 UTCEG score recompute▼ 0.60
  19. 2026-09-23 07:58 UTCVendor advisory
  20. 2026-09-22 19:51 UTCNVD updateCVSS v3 → 6.5 · severity → MEDIUM
  21. 2026-09-22 19:49 UTCEG score recompute
  22. 2026-09-22 19:49 UTCVendor advisory
  23. 2026-09-22 06:08 UTCEG score recompute
  24. 2026-09-22 06:08 UTCVendor advisory
  25. 2026-09-21 18:01 UTCVendor advisory
  26. 2026-09-21 05:52 UTCEG score recompute
  27. 2026-09-21 05:52 UTCVendor advisory
  28. 2026-09-20 20:16 UTCEPSS rescore
  29. 2026-09-20 17:17 UTCVendor advisory
  30. 2026-09-20 05:00 UTCVendor advisory
  31. 2026-09-19 16:51 UTCEG score recompute
  32. 2026-09-19 16:51 UTCVendor advisory
  33. 2026-09-19 04:44 UTCEG score recompute
  34. 2026-09-19 04:44 UTCVendor advisory
  35. 2026-09-18 19:28 UTCEPSS rescore
  36. 2026-09-18 16:36 UTCVendor advisory
  37. 2026-09-18 03:45 UTCEG score recompute
  38. 2026-09-18 03:45 UTCVendor advisory
  39. 2026-09-17 15:39 UTCVendor advisory
  40. 2026-09-17 03:32 UTCVendor advisory
  41. 2026-09-16 14:33 UTCEG score recompute
  42. 2026-09-16 14:33 UTCVendor advisory
  43. 2026-09-16 14:08 UTCEPSS rescore
  44. 2026-09-16 05:15 UTCEPSS rescore
  45. 2026-09-16 02:07 UTCVendor advisory
  46. 2026-09-15 14:00 UTCEG score recompute
  47. 2026-09-15 14:00 UTCVendor advisory
  48. 2026-09-15 01:53 UTCVendor advisory
  49. 2026-09-14 13:46 UTCVendor advisory
  50. 2026-09-14 01:31 UTCEG score recompute
  51. 2026-09-14 01:31 UTCVendor advisory
  52. 2026-09-13 13:25 UTCVendor advisory
  53. 2026-09-13 01:19 UTCEG score recompute
  54. 2026-09-13 01:19 UTCVendor advisory
  55. 2026-09-12 13:12 UTCVendor advisory
  56. 2026-09-12 01:06 UTCEG score recompute
  57. 2026-09-12 01:06 UTCVendor advisory
  58. 2026-09-11 14:53 UTCEPSS rescore
  59. 2026-09-11 12:59 UTCEG score recompute
  60. 2026-09-11 12:59 UTCVendor advisory
  61. 2026-09-11 09:37 UTCEPSS rescore
  62. 2026-09-11 00:26 UTCVendor advisory
  63. 2026-09-10 12:19 UTCEG score recompute
  64. 2026-09-10 12:19 UTCVendor advisory
  65. 2026-09-09 22:36 UTCVendor advisory
  66. 2026-09-09 14:42 UTCVendor advisory
  67. 2026-09-09 02:34 UTCEG score recompute
  68. 2026-09-09 02:34 UTCVendor advisory
  69. 2026-09-08 22:01 UTCEPSS rescore
  70. 2026-09-08 06:06 UTCVendor advisory
  71. 2026-09-07 17:56 UTCEG score recompute
  72. 2026-09-07 17:56 UTCVendor advisory
  73. 2026-09-07 16:01 UTCEPSS rescore
  74. 2026-09-07 05:50 UTCVendor advisory
  75. 2026-09-06 17:43 UTCEG score recompute

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-63652?
CVE-2026-63652 is a medium vulnerability published on August 19, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, rdpsndserverrecvformats in channels/rdpsnd/server/rdpsndmain.c frees context->clientformats on a malformed Client Audio Formats PDU without clearing the owning pointer or numclientformats. An authenticated RDP client…
When was CVE-2026-63652 disclosed?
CVE-2026-63652 was first published on August 19, 2026, with the most recent update on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63652 actively exploited?
CVE-2026-63652 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63652?
CVE-2026-63652 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-63652?
A fix for CVE-2026-63652 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63652 are linked in the Vendor Advisories panel on this page.

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