High severity · published Oct 12, 2026
CVE-2026-109242
FreeRDP before 3.0.0 and 3.6.0 before 3.32.0 Uninitialized Heap Disclosure via Progressive Codec Tile Upgrade
7.1
CVSS
0.3%
EPSS
No
On KEV
Description
FreeRDP before 3.0.0 and 3.6.0 before 3.32.0 renders uninitialized heap memory from un-decoded progressive tiles because the tile->current buffer is allocated without zeroing. A malicious RDP server can send a crafted WBT_TILE_FIRST then WBT_TILE_UPGRADE sequence to paint heap bytes onscreen or abort the client process.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeRDP · FreeRDP
before 3.0.0; 3.6.0 before 3.32.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109242
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109242
vendor-advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4mpr-hmqx-83q8
third-party-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.0.0-and-3.6.0-before-3.32.0-uninitialized-heap-disclosure-via-progressive-codec-tile-upgrade
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