CVE-2026-66401

LOWPre-NVD 2.12.1—
EchelonGraph scoreHIGH 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%CVSS: 2.1Exploit: Elevated riskExposed: 0

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

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
2.1(high)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity21% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

August 1, 2026

Last Modified

August 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 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 ... 3.28.0+dfsg-2 (37 versions)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 / 34× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-19 17:04 UTCEPSS rescore
  3. 2026-08-19 00:37 UTCEG score recompute
  4. 2026-08-19 00:37 UTCGHSA enrichment
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-17 13:47 UTCEPSS rescore
  7. 2026-08-16 14:56 UTCEPSS rescore
  8. 2026-08-15 23:16 UTCEG score recompute
  9. 2026-08-15 23:16 UTCGHSA enrichment
  10. 2026-08-15 01:30 UTCEPSS rescore
  11. 2026-08-13 22:00 UTCEPSS rescore
  12. 2026-08-12 22:01 UTCEG score recompute
  13. 2026-08-12 22:01 UTCGHSA enrichment
  14. 2026-08-12 13:51 UTCEPSS rescore
  15. 2026-08-11 00:00 UTCEPSS rescore
  16. 2026-08-09 20:46 UTCEG score recompute
  17. 2026-08-09 20:46 UTCGHSA enrichment
  18. 2026-08-09 13:47 UTCEPSS rescore
  19. 2026-08-08 16:37 UTCEPSS rescore
  20. 2026-08-06 19:32 UTCEG score recompute
  21. 2026-08-06 19:32 UTCGHSA enrichment
  22. 2026-08-06 13:47 UTCEPSS rescore
  23. 2026-08-05 19:17 UTCEPSS rescore
  24. 2026-08-05 19:17 UTCEPSS rescore
  25. 2026-08-04 15:10 UTCEPSS rescore
Show 9 more
  1. 2026-08-04 10:39 UTCEPSS rescore
  2. 2026-08-03 18:17 UTCEG score recompute
  3. 2026-08-03 18:17 UTCGHSA enrichment
  4. 2026-08-03 18:00 UTCEG score recompute
  5. 2026-08-03 18:00 UTCGHSA enrichment
  6. 2026-08-03 10:36 UTCEPSS rescore
  7. 2026-08-01 13:18 UTCEG score recompute
  8. 2026-08-01 12:43 UTCEG score recompute
  9. 2026-08-01 12:42 UTCMITRE cvelistV5first tracked

Related CVEs(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 in the National Vulnerability Database on August 1, 2026, with the most recent update on August 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% probability of exploitation in the next 30 days, which ranks it in the top 95.2% of all scored CVEs.
What is the CVSS score of CVE-2026-66401?
CVE-2026-66401 has a CVSS v3 base score of 2.1 (NVD).
How do I remediate CVE-2026-66401?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66401, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-66401

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