Bug 2546599 (CVE-2026-105842)

Summary: CVE-2026-105842 lrzsz: lrzsz: Denial of Service via heap-based buffer overflow from oversized filenames
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 lrzsz. A remote attacker acting as a malicious sender can trigger a heap-based buffer overflow by providing an excessively long filename during a ZMODEM file transfer. This flaw allows the attacker to corrupt memory and crash the application, resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2546644    
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Description OSIDB Bzimport 2026-10-06 13:49:00 UTC 
lrzsz before 0.13.0 contains a heap-based buffer overflow vulnerability in procheader() of the lrz receive utility when copying overlong sender-supplied filenames into Pathname. Malicious ZMODEM senders can supply filenames up to 8192 bytes, overflowing the buffer via sprintf() in pipe mode or strcpy() to corrupt heap memory and crash lrz.