Bug 2555632 (CVE-2026-112279)

Summary: CVE-2026-112279 rdesktop: rdesktop: Denial of Service via crafted bitmap cache orders
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in rdesktop. A malicious Remote Desktop Protocol (RDP) server can cause a Denial of Service (DoS) by sending specially crafted bitmap cache orders to a connecting client. Due to insufficient input validation when handling bitmap cache data, the client application can read memory past the allocated buffer. This out-of-bounds read causes the client process to crash, terminating the remote session.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2556359, 2556360    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-19 14:36:23 UTC 
rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in process_bmpcache2() in orders.c that allows malicious RDP servers to crash clients via crafted revision-2 bitmap cache orders. Attackers can send an uncompressed order with large width/height or an underflowing mode nibble and short payload, causing memcpy() reads past the receive buffer and denial of service.