UnratedFix available

DEBIAN-CVE-2026-23879

Type: advisorySource: OSV1 source record

py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Versions 1.1.2 and below contain an an arbitrary file write vulnerability, which allows symbolic links to be recreated outside the destination directory via crafted malicious symbolic link chains. When using extractall to extract an archive, the library restores these symbolic links, linking them to arbitrary directories on the host file system. During extraction, the program only checks the link arcname within the destination directory, but ignores the combined symlink path resolution. Attackers can exploit this vulnerability by constructing malicious archives, thereby bypassing the directory boundary restrictions implemented by the extractor. Subsequent extraction of regular files through these symbolic links can result in arbitrary file writes. This vulnerability may lead to remote code execution, privilege escalation, data corruption, or denial of service. This issue has been fixed in version 1.1.3.

Announced 24 Jun 2026Source revision 1

Original source ↗

DEBIAN-CVE-2026-23879

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-23879

py7zr

Source reference: /affected/0/package/name

Affected versions: 0.11.3+dfsg-5
Source reference: /affected/0/versions
0.11.3+dfsg-6
Source reference: /affected/0/versions
0.11.3+dfsg-7
Source reference: /affected/0/versions
0.11.3+dfsg-8
Source reference: /affected/0/versions
0.21.0+dfsg-1
Source reference: /affected/0/versions
0.21.0+dfsg-2
Source reference: /affected/0/versions
0.21.1+dfsg-1
Source reference: /affected/0/versions
0.22.0+dfsg-1
Source reference: /affected/0/versions
1.0.0+dfsg1-1
Source reference: /affected/0/versions
1.0.0+dfsg1-2
Source reference: /affected/0/versions
1.0.0+dfsg1-3
Source reference: /affected/0/versions
1.0.0+dfsg1-3~bpo13+1
Source reference: /affected/0/versions
1.0.0+dfsg1-4
Source reference: /affected/0/versions
1.0.0+dfsg1-5
Source reference: /affected/0/versions
1.1.0+dfsg-1~exp1
Source reference: /affected/0/versions
1.1.2+dfsg-1
Source reference: /affected/0/versions
1.1.2+dfsg-1~exp1
Source reference: /affected/0/versions
1.1.2+dfsg-2
Source reference: /affected/0/versions
1.1.2+really1.1.0+dfsg-1
Source reference: /affected/0/versions
1.1.2-1+really1.1.0+dfsg-1
Source reference: /affected/0/versions
1.1.2-1+really1.1.0+dfsg-2
Source reference: /affected/0/versions
1.1.3+dfsg-1
Source reference: /affected/0/versions
1.1.3+dfsg-2
Source reference: /affected/0/versions
1.1.3+dfsg-3
Source reference: /affected/0/versions
1.1.3+dfsg-4
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

py7zr

Source reference: /affected/1/package/name

Affected versions: 0.22.0+dfsg-1
Source reference: /affected/1/versions
1.0.0+dfsg1-1
Source reference: /affected/1/versions
1.0.0+dfsg1-2
Source reference: /affected/1/versions
1.0.0+dfsg1-3
Source reference: /affected/1/versions
1.0.0+dfsg1-3~bpo13+1
Source reference: /affected/1/versions
1.0.0+dfsg1-4
Source reference: /affected/1/versions
1.0.0+dfsg1-5
Source reference: /affected/1/versions
1.1.0+dfsg-1~exp1
Source reference: /affected/1/versions
1.1.2+dfsg-1
Source reference: /affected/1/versions
1.1.2+dfsg-1~exp1
Source reference: /affected/1/versions
1.1.2+dfsg-2
Source reference: /affected/1/versions
1.1.2+really1.1.0+dfsg-1
Source reference: /affected/1/versions
1.1.2-1+really1.1.0+dfsg-1
Source reference: /affected/1/versions
1.1.2-1+really1.1.0+dfsg-2
Source reference: /affected/1/versions
1.1.3+dfsg-1
Source reference: /affected/1/versions
1.1.3+dfsg-2
Source reference: /affected/1/versions
1.1.3+dfsg-3
Source reference: /affected/1/versions
1.1.3+dfsg-4
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

py7zr

Source reference: /affected/2/package/name

Affected versions: 0.22.0+dfsg-1
Source reference: /affected/2/versions
1.0.0+dfsg1-1
Source reference: /affected/2/versions
1.0.0+dfsg1-2
Source reference: /affected/2/versions
1.0.0+dfsg1-3
Source reference: /affected/2/versions
1.0.0+dfsg1-3~bpo13+1
Source reference: /affected/2/versions
1.0.0+dfsg1-4
Source reference: /affected/2/versions
1.0.0+dfsg1-5
Source reference: /affected/2/versions
1.1.0+dfsg-1~exp1
Source reference: /affected/2/versions
1.1.2+dfsg-1~exp1
Source reference: /affected/2/versions
Fixed versions: 1.1.2+dfsg-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "py7zr",
      "purl": "pkg:deb/debian/py7zr?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "0.11.3+dfsg-5",
      "0.11.3+dfsg-6",
      "0.11.3+dfsg-7",
      "0.11.3+dfsg-8",
      "0.21.0+dfsg-1",
      "0.21.0+dfsg-2",
      "0.21.1+dfsg-1",
      "0.22.0+dfsg-1",
      "1.0.0+dfsg1-1",
      "1.0.0+dfsg1-2",
      "1.0.0+dfsg1-3",
      "1.0.0+dfsg1-3~bpo13+1",
      "1.0.0+dfsg1-4",
      "1.0.0+dfsg1-5",
      "1.1.0+dfsg-1~exp1",
      "1.1.2+dfsg-1",
      "1.1.2+dfsg-1~exp1",
      "1.1.2+dfsg-2",
      "1.1.2+really1.1.0+dfsg-1",
      "1.1.2-1+really1.1.0+dfsg-1",
      "1.1.2-1+really1.1.0+dfsg-2",
      "1.1.3+dfsg-1",
      "1.1.3+dfsg-2",
      "1.1.3+dfsg-3",
      "1.1.3+dfsg-4"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23879.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "py7zr",
      "purl": "pkg:deb/debian/py7zr?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "0.22.0+dfsg-1",
      "1.0.0+dfsg1-1",
      "1.0.0+dfsg1-2",
      "1.0.0+dfsg1-3",
      "1.0.0+dfsg1-3~bpo13+1",
      "1.0.0+dfsg1-4",
      "1.0.0+dfsg1-5",
      "1.1.0+dfsg-1~exp1",
      "1.1.2+dfsg-1",
      "1.1.2+dfsg-1~exp1",
      "1.1.2+dfsg-2",
      "1.1.2+really1.1.0+dfsg-1",
      "1.1.2-1+really1.1.0+dfsg-1",
      "1.1.2-1+really1.1.0+dfsg-2",
      "1.1.3+dfsg-1",
      "1.1.3+dfsg-2",
      "1.1.3+dfsg-3",
      "1.1.3+dfsg-4"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23879.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.1.2+dfsg-1"
          }
        ]
      }
    ],
    "package": {
      "name": "py7zr",
      "purl": "pkg:deb/debian/py7zr?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "0.22.0+dfsg-1",
      "1.0.0+dfsg1-1",
      "1.0.0+dfsg1-2",
      "1.0.0+dfsg1-3",
      "1.0.0+dfsg1-3~bpo13+1",
      "1.0.0+dfsg1-4",
      "1.0.0+dfsg1-5",
      "1.1.0+dfsg-1~exp1",
      "1.1.2+dfsg-1~exp1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23879.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #56228 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 16:31:28 GMT
Publisher date: Wed, 24 Jun 2026 20:16:31 GMT

Read the original announcement