Bug 2550534 (CVE-2026-109677)

Summary: CVE-2026-109677 freerdp: FreeRDP 2.0.0-beta1 before 3.28.0 Out-of-Bounds Read via LocateCardsByATRA Handler
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 FreeRDP. This vulnerability allows information disclosure of client heap memory to a malicious Remote Desktop Protocol (RDP) server when a user connects to it. Due to improper bounds checking on smartcard pattern byte counts, the server can supply crafted data that triggers out-of-bounds memory reads and creates a timing oracle. By measuring query response times, an attacker can extract memory contents bit-by-bit to undermine memory protections like Address Space Layout Randomization (ASLR).
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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: 2554004, 2554005, 2554006    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-13 13:57:54 UTC
FreeRDP from 2.0.0-beta1 before 3.28.0 contains an out-of-bounds read vulnerability in smartcard_LocateCardsByATRA_Call because the ATR pattern cbAtr byte count is not capped. Malicious RDP servers can send crafted ATR mask arrays to use query timing as an oracle, leaking heap memory bit-by-bit to defeat ASLR and aid RCE exploits.