MEDIUM 5.3 NVD
CVE-2026-117556
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 remain
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://github.com/zchunk/zchunk
- https://github.com/zchunk/zchunk/blob/1.5.4/src/lib/header.c#L167
- https://github.com/zchunk/zchunk/commit/02b371a64bf98245df97315d07c684a0ca5ea1df
- https://github.com/zchunk/zchunk/issues/119
- https://github.com/zchunk/zchunk/releases/tag/1.5.5
This medium severity vulnerability with a CVSS score of 5.3 was published on 2026-10-27 via NVD.
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