CVE-2026-91956

MEDIUM

6.5

CVSS v3

Description

FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the URBDRC channel's func_get_ep_desc function that indexes interface arrays by position instead of protocol field InterfaceNumber. A malicious RDP server can send a crafted SELECT_CONFIGURATION message with permuted InterfaceNumber values to read past allocated heap memory and crash the client.

CWE-125Out-of-bounds Read

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

TridentStack Control tracks known vulnerabilities across your Windows, macOS, and Linux fleet and shows the fix as soon as one is published. See how it works

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

0.35%probability of exploitation in 30 days

28thpercentile

Low risk: more likely to be exploited than 28% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV + Ransom	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix
CVE-2023-21769	High	7.5	89%	-	Fix
CVE-2023-49285	High	8.6	88%	-	Fix

Common questions

How do I fix CVE-2026-91956?

No published fix for CVE-2026-91956 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

Is CVE-2026-91956 being actively exploited?

Not that we know of. CVE-2026-91956 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.35% is the estimated probability that it will be exploited in the next 30 days. That is higher than 28% of all scored CVEs.

How severe is CVE-2026-91956?

CVE-2026-91956 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Embed a live status badge for CVE-2026-91956

Markdown

[![CVE-2026-91956](https://tridentstack.com/cve/badge/CVE-2026-91956.svg)](https://tridentstack.com/cve/CVE-2026-91956)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-91956"><img src="https://tridentstack.com/cve/badge/CVE-2026-91956.svg" alt="CVE-2026-91956"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-18.