CVE Catalog

CVE-2026-117556

MediumCVSS 4.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.33%

26th percentile - higher than 26% of all known CVEs

Summary

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. A crafted .zck file whose header ends inside a compressed integer causes reads past the heap header buffer.

Risk Assessment

An attacker can supply a malicious .zck file, potentially causing application crashes. This may affect availability of systems processing zchunk files.

Recommendation

Upgrade zchunk to version 1.5.5 or later. Until then, avoid processing untrusted .zck files.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS