CVE-2026-91955

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

FreeRDP before 3.31.0 fails to validate client-supplied DesktopWidth and DesktopHeight values during GCC negotiation, allowing remote attackers to crash the server. Attackers can send crafted RDP packets with zero or oversized dimensions to trigger division-by-zero or assertion failures in multifragment update capability calculations, terminating the server process.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

FreeRDP before 3.31.0 Denial of Service via Desktop Dimensions | Advisories | VulnCheck

https://www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-desktop-dimensions
github Patch Available🟡 PoC Available

FreeRDP: server stores client Core Data DesktopWidth/Height unvalidated in GCC negotiation — SIGFPE/assert-abort kills any default-build libfreerdp server pre-auth at Demand Active (CWE-617/CWE-369) · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4464-r7qj-pgrx

Vendor Advisories for CVE-2026-91955(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 21× in last 7d / 21× 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. 2026-09-19 17:03 UTCEG score recompute
  2. 2026-09-19 17:03 UTCGHSA enrichment
  3. 2026-09-19 05:43 UTCEG score recompute
  4. 2026-09-19 05:43 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 18:23 UTCGHSA enrichment
  7. 2026-09-18 07:04 UTCGHSA enrichment
  8. 2026-09-17 19:45 UTCEG score recompute
  9. 2026-09-17 19:45 UTCGHSA enrichment
  10. 2026-09-17 19:32 UTCEPSS rescore
  11. 2026-09-17 08:26 UTCGHSA enrichment
  12. 2026-09-16 21:07 UTCGHSA enrichment
  13. 2026-09-16 15:13 UTCEG score recompute
  14. 2026-09-16 15:13 UTCGHSA enrichment
  15. 2026-09-16 14:09 UTCEPSS rescore
  16. 2026-09-16 03:53 UTCEG score recompute
  17. 2026-09-16 03:53 UTCGHSA enrichment
  18. 2026-09-15 16:33 UTCEG score recompute
  19. 2026-09-15 16:03 UTCEG score recompute
  20. 2026-09-15 15:23 UTCEG score recompute
  21. 2026-09-15 15:22 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-91955?
CVE-2026-91955 is a high vulnerability published on September 15, 2026. FreeRDP before 3.31.0 fails to validate client-supplied DesktopWidth and DesktopHeight values during GCC negotiation, allowing remote attackers to crash the server. Attackers can send crafted RDP packets with zero or oversized dimensions to trigger division-by-zero or assertion failures in…
When was CVE-2026-91955 disclosed?
CVE-2026-91955 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91955 actively exploited?
CVE-2026-91955 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 61.4% of all scored CVEs.
What is the CVSS score of CVE-2026-91955?
CVE-2026-91955 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-91955?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91955, 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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