Vulnerability Description
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 Score
LOW
Related Weaknesses (CWE)
References
- https://github.com/kyz/libmspack
- https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/mszipd.c#L264-
- https://github.com/kyz/libmspack/issues/60
- https://hackmd.io/@haindpwn/libmspack-mszip-uninit-window-info-leak
- https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-m
FAQ
What is CVE-2026-119602?
CVE-2026-119602 is a vulnerability with a CVSS score of 3.7 (LOW). 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. Attacke...
How severe is CVE-2026-119602?
CVE-2026-119602 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-119602?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.