UBUNTU-CVE-2026-81878 (CVE-2026-81878)

Vulnerability from osv_ubuntu – Published: 2026-09-22 16:18 – Updated: 2026-10-17 09:54 – Source website
VLAI
Details

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libradare2-0.9.6",
            "binary_version": "0.9.6-3.1ubuntu1"
          },
          {
            "binary_name": "libradare2-common",
            "binary_version": "0.9.6-3.1ubuntu1"
          },
          {
            "binary_name": "radare2",
            "binary_version": "0.9.6-3.1ubuntu1"
          },
          {
            "binary_name": "radare2-plugins",
            "binary_version": "0.9.6-3.1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "radare2",
        "purl": "pkg:deb/ubuntu/radare2@0.9.6-3.1ubuntu1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.6-3.1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libradare2-2.3",
            "binary_version": "2.3.0+dfsg-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "libradare2-common",
            "binary_version": "2.3.0+dfsg-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "radare2",
            "binary_version": "2.3.0+dfsg-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "radare2",
        "purl": "pkg:deb/ubuntu/radare2@2.3.0+dfsg-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.0+dfsg-1",
        "2.0.0+dfsg-1",
        "2.1.0+dfsg-1",
        "2.3.0+dfsg-1",
        "2.3.0+dfsg-2",
        "2.3.0+dfsg-2ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libradare2-4.2.1",
            "binary_version": "4.2.1+dfsg-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "libradare2-common",
            "binary_version": "4.2.1+dfsg-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "radare2",
            "binary_version": "4.2.1+dfsg-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "radare2",
        "purl": "pkg:deb/ubuntu/radare2@4.2.1+dfsg-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.1+dfsg-5build1",
        "4.0.0+dfsg-1",
        "4.2.1+dfsg-1",
        "4.2.1+dfsg-2",
        "4.2.1+dfsg-2ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libradare2-5.0.0t64",
            "binary_version": "5.5.0+dfsg-1.1ubuntu3+esm1"
          },
          {
            "binary_name": "libradare2-common",
            "binary_version": "5.5.0+dfsg-1.1ubuntu3+esm1"
          },
          {
            "binary_name": "radare2",
            "binary_version": "5.5.0+dfsg-1.1ubuntu3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "radare2",
        "purl": "pkg:deb/ubuntu/radare2@5.5.0+dfsg-1.1ubuntu3+esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.5.0+dfsg-1ubuntu1",
        "5.5.0+dfsg-1.1ubuntu2",
        "5.5.0+dfsg-1.1ubuntu3",
        "5.5.0+dfsg-1.1ubuntu3+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libradare2-6.0.0t64",
            "binary_version": "6.1.8+ds-1"
          },
          {
            "binary_name": "libradare2-common",
            "binary_version": "6.1.8+ds-1"
          },
          {
            "binary_name": "radare2",
            "binary_version": "6.1.8+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "radare2",
        "purl": "pkg:deb/ubuntu/radare2@6.1.8+ds-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.0.7+ds-1",
        "6.1.6+ds-2",
        "6.1.6+ds-3",
        "6.1.8+ds-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libradare2-6.0.0t64",
            "binary_version": "6.0.7+ds-1"
          },
          {
            "binary_name": "libradare2-common",
            "binary_version": "6.0.7+ds-1"
          },
          {
            "binary_name": "radare2",
            "binary_version": "6.0.7+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "radare2",
        "purl": "pkg:deb/ubuntu/radare2@6.0.7+ds-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.9.8+dfsg-2",
        "6.0.4+dfsg-1",
        "6.0.7+ds-1"
      ]
    }
  ],
  "aliases": [],
  "details": "radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2\u0027s CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0.",
  "id": "UBUNTU-CVE-2026-81878",
  "modified": "2026-10-17T09:54:11Z",
  "published": "2026-09-22T16:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-81878"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-81878"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/radareorg/radare2/security/advisories/GHSA-9phv-v2w8-56j3"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/radareorg/radare2/issues/26222"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/radareorg/radare2/pull/26177"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/radareorg/radare2/releases/tag/6.2.0"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-81878"
  ]
}



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