UnratedFix available

DEBIAN-CVE-2026-6100

Type: advisorySource: OSV1 source record

Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-used. This scenario can be triggered if the process is under memory pressure. The fix cleans up the dangling pointer in this specific error condition. The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable.

Announced 13 Apr 2026Source revision 1

Original source ↗

DEBIAN-CVE-2026-6100

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-2026-6100

python3.11

Source reference: /affected/0/package/name

Affected versions: 3.11.2-6
Source reference: /affected/0/versions
3.11.2-6+deb12u1
Source reference: /affected/0/versions
3.11.2-6+deb12u2
Source reference: /affected/0/versions
3.11.2-6+deb12u3
Source reference: /affected/0/versions
3.11.2-6+deb12u4
Source reference: /affected/0/versions
3.11.2-6+deb12u5
Source reference: /affected/0/versions
3.11.2-6+deb12u6
Source reference: /affected/0/versions
3.11.2-6+deb12u7
Source reference: /affected/0/versions
Fixed versions: 3.11.2-6+deb12u8
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

python3.13

Source reference: /affected/1/package/name

Affected versions: 3.13.5-2
Source reference: /affected/1/versions
3.13.5-2+deb13u1
Source reference: /affected/1/versions
Fixed versions: 3.13.5-2+deb13u2
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

python3.13

Source reference: /affected/2/package/name

Affected versions: 3.13.11-1
Source reference: /affected/2/versions
3.13.12-1
Source reference: /affected/2/versions
3.13.5-2
Source reference: /affected/2/versions
3.13.6-1
Source reference: /affected/2/versions
3.13.7-1
Source reference: /affected/2/versions
3.13.8-1
Source reference: /affected/2/versions
3.13.9-1
Source reference: /affected/2/versions
Fixed versions: 3.13.14-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

python3.14

Source reference: /affected/3/package/name

Affected versions: 3.14.0-1
Source reference: /affected/3/versions
3.14.0-2
Source reference: /affected/3/versions
3.14.0-3
Source reference: /affected/3/versions
3.14.0-4
Source reference: /affected/3/versions
3.14.0-5
Source reference: /affected/3/versions
3.14.0~a7-1
Source reference: /affected/3/versions
3.14.0~b1-1
Source reference: /affected/3/versions
3.14.0~b2-1
Source reference: /affected/3/versions
3.14.0~b3-1
Source reference: /affected/3/versions
3.14.0~b4-1
Source reference: /affected/3/versions
3.14.0~rc1-1
Source reference: /affected/3/versions
3.14.0~rc2-1
Source reference: /affected/3/versions
3.14.0~rc3-1
Source reference: /affected/3/versions
3.14.2-1
Source reference: /affected/3/versions
3.14.3-1
Source reference: /affected/3/versions
3.14.3-2
Source reference: /affected/3/versions
3.14.3-3
Source reference: /affected/3/versions
3.14.3-4
Source reference: /affected/3/versions
3.14.3-5
Source reference: /affected/3/versions
3.14.4-1
Source reference: /affected/3/versions
3.14.4-2
Source reference: /affected/3/versions
Fixed versions: 3.14.5~rc1-1
Source reference: /affected/3/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"
          },
          {
            "fixed": "3.11.2-6+deb12u8"
          }
        ]
      }
    ],
    "package": {
      "name": "python3.11",
      "purl": "pkg:deb/debian/python3.11?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.11.2-6",
      "3.11.2-6+deb12u1",
      "3.11.2-6+deb12u2",
      "3.11.2-6+deb12u3",
      "3.11.2-6+deb12u4",
      "3.11.2-6+deb12u5",
      "3.11.2-6+deb12u6",
      "3.11.2-6+deb12u7"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6100.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.13.5-2+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "python3.13",
      "purl": "pkg:deb/debian/python3.13?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.13.5-2",
      "3.13.5-2+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6100.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.13.14-1"
          }
        ]
      }
    ],
    "package": {
      "name": "python3.13",
      "purl": "pkg:deb/debian/python3.13?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.13.11-1",
      "3.13.12-1",
      "3.13.5-2",
      "3.13.6-1",
      "3.13.7-1",
      "3.13.8-1",
      "3.13.9-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6100.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.14.5~rc1-1"
          }
        ]
      }
    ],
    "package": {
      "name": "python3.14",
      "purl": "pkg:deb/debian/python3.14?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.14.0-1",
      "3.14.0-2",
      "3.14.0-3",
      "3.14.0-4",
      "3.14.0-5",
      "3.14.0~a7-1",
      "3.14.0~b1-1",
      "3.14.0~b2-1",
      "3.14.0~b3-1",
      "3.14.0~b4-1",
      "3.14.0~rc1-1",
      "3.14.0~rc2-1",
      "3.14.0~rc3-1",
      "3.14.2-1",
      "3.14.3-1",
      "3.14.3-2",
      "3.14.3-3",
      "3.14.3-4",
      "3.14.3-5",
      "3.14.4-1",
      "3.14.4-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6100.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #58075 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 17:37:01 GMT
Publisher date: Mon, 13 Apr 2026 18:16:31 GMT

Read the original announcement