{
  "cveId": "CVE-2026-48095",
  "url": "https://patchblox.com/security/cve/CVE-2026-48095",
  "summary": "CVE-2026-48095 is fixed in 10 products on 1 platform, first by ALAS2023-2026-1820, released June 8, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "7zip: 7-Zip is a file archiver with a high compression ratio",
  "description": "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 \u003C\u003C (BlockSizeLog \u002B CompressionUnit), and a crafted image with ClusterSizeLog \u003E= 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 \u0022NTFS    \u0022 at offset 3, will open a crafted image regardless of file extension during extraction or testing. Version 26.01 fixes the issue.",
  "published": "2026-06-05T15:16:53Z",
  "severity": "high",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "epss": 0.01116,
  "epssPercentile": 0.6627,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "7zip",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "22.01\u002Breally26.01\u002Bdfsg-0\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-48095",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-48095",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "7zip",
      "release": "Debian 14",
      "fixedVersion": "26.01\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2026-48095",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-48095",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "7zip",
      "release": "amzn 2023",
      "fixedVersion": "26.01-14.amzn2023.0.1",
      "fix": "ALAS2023-2026-1820",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1820",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "7zip",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "26.01-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21038-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21038-1",
      "released": "2026-06-23T12:46:58Z"
    },
    {
      "platform": "linux",
      "product": "7zip",
      "release": "sles 15.6",
      "fixedVersion": "26.01-150400.9.6.1",
      "fix": "SUSE-SU-2026:2696-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2696-1",
      "released": "2026-06-30T09:10:04Z"
    },
    {
      "platform": "linux",
      "product": "7zip",
      "release": "sles 15.7",
      "fixedVersion": "26.01-150400.9.6.1",
      "fix": "SUSE-SU-2026:2696-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2696-1",
      "released": "2026-06-30T09:10:04Z"
    },
    {
      "platform": "linux",
      "product": "7zip",
      "release": "sles 16.0",
      "fixedVersion": "26.01-160000.1.1",
      "fix": "SUSE-SU-2026:22347-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22347-1",
      "released": "2026-06-23T12:43:00Z"
    },
    {
      "platform": "linux",
      "product": "7zip-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "26.01-14.amzn2023.0.1",
      "fix": "ALAS2023-2026-1820",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1820",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "7zip-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "26.01-14.amzn2023.0.1",
      "fix": "ALAS2023-2026-1820",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1820",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "7zip-reduced",
      "release": "amzn 2023",
      "fixedVersion": "26.01-14.amzn2023.0.1",
      "fix": "ALAS2023-2026-1820",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1820",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "7zip-reduced-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "26.01-14.amzn2023.0.1",
      "fix": "ALAS2023-2026-1820",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1820",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "7zip-standalone",
      "release": "amzn 2023",
      "fixedVersion": "26.01-14.amzn2023.0.1",
      "fix": "ALAS2023-2026-1820",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1820",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "7zip-standalone-all",
      "release": "amzn 2023",
      "fixedVersion": "26.01-14.amzn2023.0.1",
      "fix": "ALAS2023-2026-1820",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1820",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "7zip-standalone-all-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "26.01-14.amzn2023.0.1",
      "fix": "ALAS2023-2026-1820",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1820",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "7zip-standalone-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "26.01-14.amzn2023.0.1",
      "fix": "ALAS2023-2026-1820",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1820",
      "released": "2026-06-08T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "p7zip",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "16.02\u002Breally26.01\u002Bdfsg-0\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-48095",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-48095",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "p7zip",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "16.02\u002Btransitional.1",
      "fix": "DEBIAN-CVE-2026-48095",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-48095",
      "released": "2026-06-24T14:07:24Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}