CVE-2026-105842 PUBLISHED

lrzsz before 0.13.0 Heap Buffer Overflow via lrz procheader() Pathname

Assigner: VulnCheck
Reserved: 05.10.2026 Published: 06.10.2026 Updated: 06.10.2026

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.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
CVSS Score: 6.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	Passive

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
CVSS Score: 6.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	Required	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Uwe Ohse
Product	lrzsz
Versions	Default: unaffected affected from 0 to 0.13.0 (excl.)

CVE-2026-105842 PUBLISHED

lrzsz before 0.13.0 Heap Buffer Overflow via lrz procheader() Pathname

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Problem Types