CVE-2026-81878

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Source
https://cve.org/CVERecord?id=CVE-2026-81878
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81878.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-81878
Aliases
  • GHSA-9phv-v2w8-56j3
Downstream
Related
Published
2026-09-22T15:07:45Z
Modified
2026-10-01T18:26:49Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
radare2: Integer overflow causes heap out-of-bounds write in radare2 PYC parser
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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-190",
        "CWE-787"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81878.json"
}
References

Affected packages

Git / github.com/radareorg/radare2

Affected ranges

Type
GIT
Repo
https://github.com/radareorg/radare2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
e1fc278734ad62f933fc6f91edb29e4ba732f402
Fixed
6727454b666b28c33837b219a5f91136461357c0
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:radare:radare2:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "6.2.0"
        }
    ],
    "source":  [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.10.0
0.10.1
0.10.2
0.10.3
0.10.4
0.10.4-termux4
0.10.5
0.10.6
0.8.6
0.8.8
0.9
0.9.2
0.9.4
0.9.6
0.9.7
0.9.8
0.9.8-rc1
0.9.8-rc2
0.9.8-rc3
0.9.8-rc4
0.9.9
1.*
1.0
1.0.0
1.0.1
1.0.2
1.1.0
1.2.0
1.2.0-git
1.3.0
1.3.0-git
1.4.0
1.5.0
1.6.0
2.*
2.0.0
2.0.1
2.1.0
2.2.0
2.4.0
2.5.0
2.6.0
2.6.9
2.7.0
2.8.0
2.9.0
3.*
3.0.0
3.0.1
3.1.0
3.1.1
3.1.2
3.1.3
3.2.0
3.2.1
3.3.0
3.4.0
3.4.1
3.5.0
3.5.1
3.6.0
3.7.0
3.7.1
3.8.0
3.9.0
4.*
4.0.0
4.1.0
4.1.1
4.2.0
4.2.1
4.3.0
4.3.1
4.4.0
4.5.1
5.*
5.0.0
5.1.0
5.1.1
5.2.0
5.2.1
5.3.0
5.3.1
5.4.0
5.4.0-git
5.4.2
5.5.0
5.5.2
5.5.4
5.6.0
5.6.2
5.6.4
5.6.6
5.6.8
5.7.0
5.7.2
5.7.4
5.7.6
5.7.8
5.8.0
5.8.2
5.8.4
5.8.6
5.8.8
5.9.0
5.9.2
5.9.4
5.9.6
5.9.8
6.*
6.0.0
6.0.2
6.0.4
6.0.6
6.0.7
6.0.8
6.1.0
6.1.2
6.1.4
6.1.6
6.1.8
Other
Continuous-Windows
continuous
radare2-windows-nightly
termux
wip
release-5.*
release-5.0.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81878.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "193483909771336220188142129180556573423",
            "length":  1233
        },
        "id":  "CVE-2026-81878-1c53e010",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0",
        "target":  {
            "file":  "libr/bin/format/pyc/marshal.c",
            "function":  "get_long_object"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
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                "252200994563852059737829862537167284598",
                "189084393422604771386144320633720254378",
                "284041963721084805130619899306555821596",
                "213118504213457659258076361067413666309",
                "258218861353680847241289658420339104112",
                "295288898152384988220448154504048785580",
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                "77132689321343786375216161116752696757",
                "336983681380904276981839644401961674017",
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                "189083655116186302962540265449456176842",
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                "251121421238390307700633666951467511560",
                "261458853681198193649413097415945018489",
                "67423791763927751846167393109016124564",
                "256226210152197469038934287827802530244",
                "249256269332260873131884287888804478272"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-81878-3841a851",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0",
        "target":  {
            "file":  "libr/bin/format/pyc/marshal.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "293828804310686423018942555672185631617",
            "length":  1178
        },
        "id":  "CVE-2026-81878-5bc3731e",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0",
        "target":  {
            "file":  "libr/bin/format/pyc/marshal.c",
            "function":  "get_complex_object"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "312175603558132869675154106529443297444",
            "length":  211
        },
        "id":  "CVE-2026-81878-e7b32f28",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0",
        "target":  {
            "file":  "libr/bin/format/pyc/marshal.c",
            "function":  "get_bytes"
        }
    }
]
vanir_signatures_modified 
"2026-09-27T08:03:19Z"