CVE-2026-91945

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
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: Elevated riskExposed services: Not assessed

A fix is available — apply it.

FreeRDP versions before 3.31.0 contain an out-of-bounds read vulnerability in smartcard response decoders that fail to validate ATR length fields against fixed inline arrays. Authenticated RDP clients can send oversized ATR lengths in PAKID_CORE_DEVICE_IOCOMPLETION responses to trigger reads past stack or heap objects, causing process termination.

CVSS v3
6.5
EG Score
6.5MEDIUMhigh confidence
EG Risk
45
EG Risk 45/100CISA 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%
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
0.6%
EPSS %ILE
45th
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

September 15, 2026

Last Modified

September 24, 2026

Advisory Details (3)

Auto-updated Sep 15, 2026
Patch available. Sources: github, github_commit.
generic

FreeRDP before 3.31.0 Out-of-bounds Read via Smartcard ATR | Advisories | VulnCheck

https://www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-smartcard-atr
github_commit

commit 9626564421df (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 9626564421df — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/9626564421df72c84f891afdbc0b20bf702f369f
github Patch Available

Smartcard response lengths are not bounded to their inline ATR arrays · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r

Vendor Advisories for CVE-2026-91945(1)

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

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.30.0+dfsg-1~bpo13+1 (40 versions)
  • every version up to 3.31.0+dfsg-1: fixed in 3.31.0+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 58× 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 19:16 UTCGHSA enrichment
  3. 2026-10-03 20:54 UTCEG score recompute
  4. 2026-10-03 20:54 UTCGHSA enrichment
  5. 2026-10-02 22:35 UTCEG score recompute
  6. 2026-10-02 22:35 UTCGHSA enrichment
  7. 2026-10-02 00:15 UTCEG score recompute
  8. 2026-10-02 00:15 UTCGHSA enrichment
  9. 2026-10-01 19:51 UTCEPSS rescore
  10. 2026-10-01 00:51 UTCEG score recompute
  11. 2026-10-01 00:51 UTCGHSA enrichment
  12. 2026-09-30 15:04 UTCEPSS rescore
  13. 2026-09-30 02:31 UTCEG score recompute
  14. 2026-09-30 02:31 UTCGHSA enrichment
  15. 2026-09-29 04:12 UTCEG score recompute
  16. 2026-09-29 04:12 UTCGHSA enrichment
  17. 2026-09-28 13:52 UTCEPSS rescore
  18. 2026-09-28 13:52 UTCEPSS rescore
  19. 2026-09-28 05:52 UTCEG score recompute
  20. 2026-09-28 05:52 UTCGHSA enrichment
  21. 2026-09-27 13:49 UTCEPSS rescore
  22. 2026-09-27 07:33 UTCEG score recompute
  23. 2026-09-27 07:33 UTCGHSA enrichment
  24. 2026-09-26 15:59 UTCEPSS rescore
  25. 2026-09-26 09:12 UTCEG score recompute
Show 33 more
  1. 2026-09-26 09:12 UTCGHSA enrichment
  2. 2026-09-25 10:52 UTCEG score recompute
  3. 2026-09-25 10:52 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 12:18 UTCGHSA enrichment
  6. 2026-09-24 07:47 UTCEG score recompute
  7. 2026-09-24 07:46 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 09:27 UTCEG score recompute
  10. 2026-09-23 09:27 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 11:07 UTCEG score recompute
  13. 2026-09-22 11:07 UTCGHSA enrichment
  14. 2026-09-21 21:09 UTCEPSS rescore
  15. 2026-09-21 12:48 UTCEG score recompute
  16. 2026-09-21 12:48 UTCGHSA enrichment
  17. 2026-09-20 20:16 UTCEPSS rescore
  18. 2026-09-20 14:28 UTCGHSA enrichment
  19. 2026-09-19 16:08 UTCEG score recompute
  20. 2026-09-19 16:08 UTCGHSA enrichment
  21. 2026-09-18 19:28 UTCEPSS rescore
  22. 2026-09-18 17:49 UTCEG score recompute
  23. 2026-09-18 17:49 UTCGHSA enrichment
  24. 2026-09-17 19:32 UTCEPSS rescore
  25. 2026-09-17 19:29 UTCGHSA enrichment
  26. 2026-09-16 21:07 UTCGHSA enrichment
  27. 2026-09-16 14:53 UTCEG score recompute
  28. 2026-09-16 14:53 UTCGHSA enrichment
  29. 2026-09-16 14:09 UTCEPSS rescore
  30. 2026-09-15 16:33 UTCEG score recompute
  31. 2026-09-15 15:59 UTCEG score recompute
  32. 2026-09-15 15:24 UTCEG score recompute
  33. 2026-09-15 15:22 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91945?
CVE-2026-91945 is a medium vulnerability published on September 15, 2026. FreeRDP versions before 3.31.0 contain an out-of-bounds read vulnerability in smartcard response decoders that fail to validate ATR length fields against fixed inline arrays. Authenticated RDP clients can send oversized ATR lengths in PAKIDCOREDEVICE_IOCOMPLETION responses to trigger reads past…
When was CVE-2026-91945 disclosed?
CVE-2026-91945 was first published on September 15, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91945 actively exploited?
CVE-2026-91945 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-91945?
CVE-2026-91945 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-91945?
A fix for CVE-2026-91945 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-91945 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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