7.1

CVE-2026-91963: FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure via urbdrc

Analyzed
AliasesUBUNTU-CVE-2026-91963DEBIAN-CVE-2026-91963
Published 15-09-2026Last modified 15-09-2026

Vulnerability summary

CVE-2026-91963 is a high (CVSS 7.1) Use of Uninitialized Variable vulnerability in freerdp. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 51.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.66%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3
RHSA-2026:75570RHSA-2026:76747RHSA-2026:76755

Timeline

  1. 15-09-2026
    PublishedVulnerability first disclosed.
  2. 15-09-2026
    Last modifiedVulnerability information updated.

Description

FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.66%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.66% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu3 products
  • freerdpAll versions (No fix recorded)
  • freerdp2All versions (No fix recorded)
  • freerdp3< 3.31.0+dfsg-0ubuntu0.24.04.1 | < 3.31.0+dfsg-0ubuntu0.26.04.1
Debian2 products
  • freerdp2All versions (No fix recorded)
  • freerdp3All versions (No fix recorded) | < 3.31.0+dfsg-1
Freerdp1 product
  • freerdp≥ 2.0.0, < 3.0.0 | ≥ 3.0.0, < 3.31.0 | < 3.31.0 | ≥ 2.0.0, < 3.31.0

3 vendors · 6 products

References

5 links