What is CVE-2023-39741?

CVE-2023-39741 is a medium-severity vulnerability in Long Range Zip Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2023-08-17.

How severe is CVE-2023-39741?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Long Range Zip Project

CVE-2023-39741

lrzip v0.651 was discovered to contain a heap overflow via the libzpaq::PostProcessor::write(int) function at /libzpaq/libzpaq.cpp. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted file.

Vulnerability class: Buffer Overflow

Published 2023-08-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (25.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Long Range Zip Project — versions 0.651

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/ckolivas/lrzip/issues/246 (Exploit, Issue Tracking)
github.com/huanglei3/lrzip_poc/tree/main/lrzip_heap_overflow (Exploit)
gist.github.com/huanglei3/ec9090096aa92445cf0a8baa8e929084

Frequently asked questions

What is CVE-2023-39741?: CVE-2023-39741 is a medium-severity vulnerability in Long Range Zip Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2023-08-17.
How severe is CVE-2023-39741?: Medium severity. CVSS v3 base score is 5.5 out of 10.