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  4. CVE 2026 91951 freerdp 3140 through 3300 out of bounds write via
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Back to active CVEs
High · CVSS 7.1CVE-2026-91951

FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrcCVE-2026-91951

Answer in brief

CVE-2026-91951 records a High severity (CVSS 7.1) vulnerability in FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrc. The current sources do not mark it as known exploited. The current feed maps FreeRDP/FreeRDP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 24, 2026Source checked Oct 31, 2026First seen by HOL Sep 15, 2026Material review Sep 24, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FreeRDP/FreeRDP (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
FreeRDP/FreeRDPgeneric>=3.14.0 <3.31.03.31.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FreeRDP/FreeRDP.
  2. 2Review the reported fix. Update FreeRDP/FreeRDP to 3.31.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 15, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in the urbdrc client channel's urb_send_current_frame_number_result() function. A malicious RDP server can send a crafted 28-byte USB redirection message to trigger a 4-byte write past the allocated 16-byte buffer, causing denial of service when verbose asserts are enabled.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-617
Source
CVE List V5
Source checked
Oct 31, 2026
References
2 linked sources
Open source record