CVE-2026-117556
CVE-2026-117556 · zchunk before 1.5.5 Heap Out-of-Bounds Read via read_preface()
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 5.3 · Medium · Fix available
- Published
- Updated
Affected products and versions
zchunk
- Versions
- ≥ 0, < 1.5.5: Affected (semver)
Update to 1.5.5
Original sources
- https://github.com/zchunk/zchunk/issues/119
- https://github.com/zchunk/zchunk
- https://github.com/zchunk/zchunk/commit/02b371a64bf98245df97315d07c684a0ca5ea1df
- https://github.com/zchunk/zchunk/releases/tag/1.5.5
- https://github.com/zchunk/zchunk/blob/1.5.4/src/lib/header.c#L167
- https://www.vulncheck.com/advisories/zchunk-before-1.5.5-heap-out-of-bounds-read-via-read-preface
- https://nvd.nist.gov/vuln/detail/CVE-2026-117556