Buffer overflow in Uwe Ohse Lrzsz
CVE-2026-105842
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- ohse.de/uwe/software/lrzsz/NEWS-0.13.0.html (vendor-advisory)
- ohse.de/uwe/software/lrzsz.html (product)
- www.vulncheck.com/advisories/lrzsz-before-0.13.0-heap-buffer-overflow-via-lrz-p… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-105842?
- CVE-2026-105842 is a medium-severity vulnerability in Uwe Ohse Lrzsz, classified under Heap-based Buffer Overflow. CVSS score: 6.4/10. Published 2026-10-06.
- How severe is CVE-2026-105842?
- Medium severity. CVSS v3 base score is 6.4 out of 10.