CVE-2026-117556

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.

References

https://www.vulncheck.com/advisories/zchunk-before-1.5.5-heap-out-of-bounds-read-via-read-preface

https://github.com/zchunk/zchunk/releases/tag/1.5.5

https://github.com/zchunk/zchunk/issues/119

https://github.com/zchunk/zchunk/commit/02b371a64bf98245df97315d07c684a0ca5ea1df

https://github.com/zchunk/zchunk/blob/1.5.4/src/lib/header.c#L167

https://github.com/zchunk/zchunk

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-110834

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS