DEBIAN-CVE-2026-48095
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-48095
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48095.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-48095
- Upstream
- Published
- 2026-06-05T15:16:53Z
- Modified
- 2026-09-14T17:03:16Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing attackers to cause arbitrary code execution or application crashes. CInStream::GetCuSize() in the NTFS handler computes the compression-unit buffer size as (UInt32)1 << (BlockSizeLog + CompressionUnit), and a crafted image with ClusterSizeLog >= 28 and CompressionUnit == 4 drives the exponent to 32, which is undefined behavior and collapses on x86/x64 so _inBuf is allocated as 1 byte. ReadStream_FALSE then writes up to 256 MB of attacker-controlled data into that 1-byte buffer in 64 KB iterations, and because the CInStream object sits only 304 bytes after _inBuf, its vtable pointer is overwritten and the next dispatched call achieves a vtable hijack. On 32-bit builds the overflow is unconditionally reached; on 64-bit it requires the parallel 8 GB _outBuf allocation to succeed, otherwise failing closed to denial of service. The NTFS handler is enabled by default in stock 7z.dll and, via signature-based fallback matching "NTFS " at offset 3, will open a crafted image regardless of file extension during extraction or testing. Version 26.01 fixes the issue.
- References
Affected packages
Debian:12 / 7zip
Package
- Name
- 7zip
- Purl
- pkg:deb/debian/7zip?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed22.01+really26.01+dfsg-0+deb12u1
Debian:13 / 7zip
Package
- Name
- 7zip
- Purl
- pkg:deb/debian/7zip?arch=source&distro=trixie
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Affected versions
24.*
25.*
26.*
Debian:14 / 7zip
Package
- Name
- 7zip
- Purl
- pkg:deb/debian/7zip?arch=source&distro=forky
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed26.01+dfsg-1
Affected versions
24.*
25.*
26.*
Debian:12 / p7zip
Package
- Name
- p7zip
- Purl
- pkg:deb/debian/p7zip?arch=source&distro=bookworm
Debian:13 / p7zip
Package
- Name
- p7zip
- Purl
- pkg:deb/debian/p7zip?arch=source&distro=trixie