Heap Out-of-Bounds Read in rdesktop Client Affects Multiple Versions
CVE-2026-112279
7.1HIGH
What is CVE-2026-112279?
The rdesktop RDP client, up to version 1.9.0, is affected by a heap out-of-bounds read vulnerability within the process_bmpcache2() function. By exploiting this flaw, malicious RDP servers can craft specific revision-2 bitmap cache orders that, when processed, may lead to a denial of service by crashing the client application. This occurs when attackers send uncompressed bitmap orders featuring anomalous width/height parameters or improperly formed payloads, resulting in memcpy() reading beyond allocated buffers. Proper mechanisms to validate incoming data are essential to mitigate this risk while using rdesktop.
Affected Version(s)
rdesktop 0 <= 1.9.0
References
CVSS V4
Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown
Timeline
Vulnerability published
Vulnerability Reserved
Credit
HaiND from the Post and Telecommunication Institute of Technology
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