Out-of-bounds Read in Libarchive

CVE-2026-4424

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attack…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (27.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-4424?
CVE-2026-4424 is a high-severity vulnerability in Libarchive, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-03-19.
How severe is CVE-2026-4424?
High severity. CVSS v3 base score is 7.5 out of 10.