CVE-2026-66401

LOWPre-NVD 2.12.1—
EchelonGraph scoreMEDIUM confidence

Score 2.1 from GitHub Security Advisory (severity: LOW) published 2026-08-01. A secondary CVSS source baseline 2.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
2.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 2.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

FreeRDP before 3.29.0 contains an out-of-bounds heap read vulnerability in the UVC H.264 extension-unit parser that fails to validate descriptor length before accessing the GUID field. A local attacker with a malicious USB video camera can trigger a heap read beyond allocated bounds during camera stream setup, causing denial of service.

CVSS v3
2.1
EG Score
2.1LOWmedium confidence
EG Risk
25
EG Risk 25/100CISA 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
Severity21% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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 1, 2026

Last Modified

September 3, 2026

References (4)

Vendor Advisories for CVE-2026-66401(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp22.10.0+dfsg1-1 ... 2.9.0+dfsg1-1~bpo11+1 (32 versions)
  • every version on: no fix on record
—
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 ... 3.28.0+dfsg-2 (37 versions)
  • every version up to 3.29.0+dfsg-1: fixed in 3.29.0+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 36× 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. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 06:25 UTCEG score recompute
  3. 2026-10-04 06:25 UTCGHSA enrichment
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-02 17:56 UTCEPSS rescore
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-10-01 02:43 UTCEG score recompute
  8. 2026-10-01 02:43 UTCGHSA enrichment
  9. 2026-09-30 15:03 UTCEPSS rescore
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-27 18:22 UTCEG score recompute
  12. 2026-09-27 18:22 UTCGHSA enrichment
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-23 17:54 UTCEPSS rescore
  15. 2026-09-22 13:16 UTCEG score recompute
  16. 2026-09-22 13:16 UTCGHSA enrichment
  17. 2026-09-20 20:16 UTCEPSS rescore
  18. 2026-09-19 08:01 UTCEG score recompute
  19. 2026-09-19 08:01 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-16 14:08 UTCEPSS rescore
  22. 2026-09-16 05:46 UTCEG score recompute
  23. 2026-09-16 05:46 UTCGHSA enrichment
  24. 2026-09-16 05:15 UTCEPSS rescore
  25. 2026-09-13 04:32 UTCEG score recompute
Show 68 more
  1. 2026-09-13 04:32 UTCGHSA enrichment
  2. 2026-09-11 14:53 UTCEPSS rescore
  3. 2026-09-11 09:37 UTCEPSS rescore
  4. 2026-09-10 03:17 UTCEG score recompute
  5. 2026-09-10 03:17 UTCGHSA enrichment
  6. 2026-09-08 22:01 UTCEPSS rescore
  7. 2026-09-07 16:01 UTCEPSS rescore
  8. 2026-09-06 21:17 UTCEG score recompute
  9. 2026-09-06 21:17 UTCGHSA enrichment
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-05 15:31 UTCEPSS rescore
  12. 2026-09-04 05:07 UTCEPSS rescore
  13. 2026-09-03 20:00 UTCEG score recompute
  14. 2026-09-03 20:00 UTCGHSA enrichment
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-09-01 04:40 UTCEPSS rescore
  18. 2026-08-31 20:46 UTCEG score recompute
  19. 2026-08-31 20:46 UTCGHSA enrichment
  20. 2026-08-31 05:44 UTCEG score recompute
  21. 2026-08-31 05:44 UTCGHSA enrichment
  22. 2026-08-30 19:17 UTCEPSS rescore
  23. 2026-08-30 01:22 UTCEPSS rescore
  24. 2026-08-28 21:42 UTCEPSS rescore
  25. 2026-08-28 04:29 UTCEG score recompute
  26. 2026-08-28 04:29 UTCGHSA enrichment
  27. 2026-08-26 14:47 UTCEPSS rescore
  28. 2026-08-25 13:49 UTCEPSS rescore
  29. 2026-08-25 03:07 UTCEG score recompute
  30. 2026-08-25 03:06 UTCGHSA enrichment
  31. 2026-08-23 00:19 UTCEPSS rescore
  32. 2026-08-22 01:52 UTCEG score recompute
  33. 2026-08-22 01:52 UTCGHSA enrichment
  34. 2026-08-21 23:49 UTCEPSS rescore
  35. 2026-08-20 22:56 UTCEPSS rescore
  36. 2026-08-19 17:04 UTCEPSS rescore
  37. 2026-08-19 00:37 UTCEG score recompute
  38. 2026-08-19 00:37 UTCGHSA enrichment
  39. 2026-08-18 13:48 UTCEPSS rescore
  40. 2026-08-17 13:47 UTCEPSS rescore
  41. 2026-08-16 14:56 UTCEPSS rescore
  42. 2026-08-15 23:16 UTCEG score recompute
  43. 2026-08-15 23:16 UTCGHSA enrichment
  44. 2026-08-15 01:30 UTCEPSS rescore
  45. 2026-08-13 22:00 UTCEPSS rescore
  46. 2026-08-12 22:01 UTCEG score recompute
  47. 2026-08-12 22:01 UTCGHSA enrichment
  48. 2026-08-12 13:51 UTCEPSS rescore
  49. 2026-08-11 00:00 UTCEPSS rescore
  50. 2026-08-09 20:46 UTCEG score recompute
  51. 2026-08-09 20:46 UTCGHSA enrichment
  52. 2026-08-09 13:47 UTCEPSS rescore
  53. 2026-08-08 16:37 UTCEPSS rescore
  54. 2026-08-06 19:32 UTCEG score recompute
  55. 2026-08-06 19:32 UTCGHSA enrichment
  56. 2026-08-06 13:47 UTCEPSS rescore
  57. 2026-08-05 19:17 UTCEPSS rescore
  58. 2026-08-05 19:17 UTCEPSS rescore
  59. 2026-08-04 15:10 UTCEPSS rescore
  60. 2026-08-04 10:39 UTCEPSS rescore
  61. 2026-08-03 18:17 UTCEG score recompute
  62. 2026-08-03 18:17 UTCGHSA enrichment
  63. 2026-08-03 18:00 UTCEG score recompute
  64. 2026-08-03 18:00 UTCGHSA enrichment
  65. 2026-08-03 10:36 UTCEPSS rescore
  66. 2026-08-01 13:18 UTCEG score recompute
  67. 2026-08-01 12:43 UTCEG score recompute
  68. 2026-08-01 12:42 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-66401?
CVE-2026-66401 is a low vulnerability published on August 1, 2026. FreeRDP before 3.29.0 contains an out-of-bounds heap read vulnerability in the UVC H.264 extension-unit parser that fails to validate descriptor length before accessing the GUID field. A local attacker with a malicious USB video camera can trigger a heap read beyond allocated bounds during camera…
When was CVE-2026-66401 disclosed?
CVE-2026-66401 was first published on August 1, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66401 actively exploited?
CVE-2026-66401 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66401?
CVE-2026-66401 has a CVSS base score of 2.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-66401?
A fix for CVE-2026-66401 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66401 are linked in the Vendor Advisories panel on this page.

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