CVE-2026-117556
MEDIUM
NVD
CVSS Score
4.3
Severity
MEDIUM
Published
Oct 27, 2026
Vendor
unknown
Description
zchunk before 1.5.5 contains a heap out-of-bounds read vulnerability in read_preface() in src/lib/header.c that passes the total header length instead of remaining bytes to compint parsing functions. Attackers can supply a crafted .zck file whose header ends inside a compressed integer, causing reads past the heap header buffer and crashing the application.