{"id":"UBUNTU-CVE-2026-81878","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.","modified":"2026-09-24T02:00:14.677589241Z","published":"2026-09-22T16:18:00Z","upstream":["CVE-2026-81878"],"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"}],"affected":[{"package":{"name":"radare2","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/radare2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.6-3.1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.6-3.1ubuntu1","binary_name":"libradare2-0.9.6"},{"binary_name":"libradare2-common","binary_version":"0.9.6-3.1ubuntu1"},{"binary_version":"0.9.6-3.1ubuntu1","binary_name":"radare2"},{"binary_version":"0.9.6-3.1ubuntu1","binary_name":"radare2-plugins"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81878.json"}},{"package":{"name":"radare2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/radare2?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":"libradare2-2.3","binary_version":"2.3.0+dfsg-2ubuntu0.1~esm1"},{"binary_version":"2.3.0+dfsg-2ubuntu0.1~esm1","binary_name":"libradare2-common"},{"binary_name":"radare2","binary_version":"2.3.0+dfsg-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81878.json"}},{"package":{"name":"radare2","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/radare2?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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_version":"4.2.1+dfsg-2ubuntu0.1~esm1","binary_name":"libradare2-4.2.1"},{"binary_version":"4.2.1+dfsg-2ubuntu0.1~esm1","binary_name":"libradare2-common"},{"binary_name":"radare2","binary_version":"4.2.1+dfsg-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81878.json"}},{"package":{"name":"radare2","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/radare2?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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_version":"5.5.0+dfsg-1.1ubuntu3+esm1","binary_name":"libradare2-5.0.0t64"},{"binary_version":"5.5.0+dfsg-1.1ubuntu3+esm1","binary_name":"libradare2-common"},{"binary_name":"radare2","binary_version":"5.5.0+dfsg-1.1ubuntu3+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81878.json"}},{"package":{"name":"radare2","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/radare2?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.9.8+dfsg-2","6.0.4+dfsg-1","6.0.7+ds-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libradare2-6.0.0t64","binary_version":"6.0.7+ds-1"},{"binary_version":"6.0.7+ds-1","binary_name":"libradare2-common"},{"binary_name":"radare2","binary_version":"6.0.7+ds-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81878.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}