CVE-2026-119602
lowlibmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via un…
libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N 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/kyz/libmspack disclosure@vulncheck.com
- https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/mszipd.c#L264-L276 disclosure@vulncheck.com
- https://github.com/kyz/libmspack/issues/60 disclosure@vulncheck.com
- https://hackmd.io/@haindpwn/libmspack-mszip-uninit-window-info-leak disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-memory-disc... disclosure@vulncheck.com