CVE-2026-117556
4.3 MEDIUMpublic exploit availablePublished 2026-10-27 · Updated 2026-10-27
AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.
NVD 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weaknesses
CWE-125
Public exploit & PoC references
All 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
- https://www.vulncheck.com/advisories/zchunk-before-1.5.5-heap-out-of-bounds-read-via-read-preface
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.
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