CVE-2026-117556
mediumzchunk 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 remai…
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/zchunk/zchunk disclosure@vulncheck.com
- https://github.com/zchunk/zchunk/blob/1.5.4/src/lib/header.c#L167 disclosure@vulncheck.com
- https://github.com/zchunk/zchunk/commit/02b371a64bf98245df97315d07c684a0ca5ea1df disclosure@vulncheck.com
- https://github.com/zchunk/zchunk/issues/119 disclosure@vulncheck.com
- https://github.com/zchunk/zchunk/releases/tag/1.5.5 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/zchunk-before-1.5.5-heap-out-of-bounds-read-via-read-... disclosure@vulncheck.com