Vulnerability Description
7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| 7-Zip | 7-Zip | >= 9.21, < 26.01 |
Related Weaknesses (CWE)
References
- https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/ExploitPatchThird Party Advisory
FAQ
What is CVE-2026-48101?
CVE-2026-48101 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCap...
How severe is CVE-2026-48101?
CVE-2026-48101 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48101?
Check the references section above for vendor advisories and patch information. Affected products include: 7-Zip 7-Zip.