CVE-2026-57585

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Source
https://cve.org/CVERecord?id=CVE-2026-57585
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-57585.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-57585
Aliases
Downstream
Related
Published
2026-06-30T21:36:23.418Z
Modified
2026-07-23T19:15:47.789471780Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error
Details

MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.

Database specific 
{
    "cwe_ids": [
        "CWE-416"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57585.json"
}
References

Affected packages

Git / github.com/msgpack/msgpack-python

Affected ranges

Type
GIT
Repo
https://github.com/msgpack/msgpack-python
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
2c56ddb5d0025ed481d962c0f5d62d19dec7476d
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.2.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.1.10
0.1.11
0.1.12
0.1.13
0.2.0
0.2.1
0.2.2
0.3.0
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.4.6
0.4.7
0.5.0
0.5.1
0.5.2
0.5.4
0.5.5
0.5.6
v0.*
v0.6.0
v0.6.1
v0.6.2
v1.*
v1.0.0
v1.0.0rc1
v1.0.1
v1.0.2
v1.0.3
v1.0.3rc1
v1.0.4
v1.0.4rc1
v1.0.5
v1.0.5rc1
v1.0.6
v1.0.6rc1
v1.0.7
v1.0.8
v1.1.0
v1.1.0rc1
v1.1.0rc2
v1.1.1
v1.1.1rc1
v1.1.2
v1.2.0
v1.2.0rc1

Database specific

vanir_signatures 
[
    {
        "target": {
            "file": "msgpack/unpack_template.h",
            "function": "unpack_construct"
        },
        "id": "CVE-2026-57585-51ccb1f0",
        "signature_type": "Function",
        "deprecated": false,
        "source": "https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d",
        "signature_version": "v1",
        "digest": {
            "function_hash": "172345746607516827835535012763858746409",
            "length": 151.0
        }
    },
    {
        "target": {
            "file": "msgpack/unpack_template.h"
        },
        "id": "CVE-2026-57585-63faddfc",
        "signature_type": "Line",
        "deprecated": false,
        "source": "https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "276059310044291053953113173331142530207",
                "47807481533832022339641570168055489655",
                "105278950186171385834643387575749839356",
                "280405200731045814838777584252964803204",
                "104450233282356083671676588003773714637",
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                "187850785093529631066914756325496747463",
                "100808187545941160794339349893840907724",
                "147870992787760195806441935461531787765",
                "123944175978742985050724227052025282384",
                "181615657339498627546848854308982087142",
                "23650770894844824204353660504341257277",
                "202940592447994686718226457021805112689",
                "316535279066559152719473847323013612945",
                "14343056947174790264509014547871811391",
                "124578409569870610394687527507957586950",
                "237408455507883797531413821133699766908",
                "212366479569126496083887708119009855848",
                "115846675617685161472193634569630554100",
                "271600383821642454526404219558283757510",
                "167540638667161158070463330911310577587",
                "120322024346186537057834128533802367369",
                "285547641352781393631273909925030488973",
                "111374658791803073882630655081927587086",
                "11122174753734765486104659393015209792",
                "313063525532112986523739214669244315316"
            ],
            "threshold": 0.9
        }
    },
    {
        "target": {
            "file": "msgpack/unpack_template.h",
            "function": "unpack_skip"
        },
        "id": "CVE-2026-57585-68670ebb",
        "signature_type": "Function",
        "deprecated": false,
        "source": "https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d",
        "signature_version": "v1",
        "digest": {
            "function_hash": "116604020480659683857486196549713437330",
            "length": 151.0
        }
    },
    {
        "target": {
            "file": "msgpack/unpack_template.h",
            "function": "unpack_execute"
        },
        "id": "CVE-2026-57585-7355c49f",
        "signature_type": "Function",
        "deprecated": false,
        "source": "https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d",
        "signature_version": "v1",
        "digest": {
            "function_hash": "100436285731131232476092087752718967793",
            "length": 6744.0
        }
    },
    {
        "target": {
            "file": "msgpack/unpack_template.h",
            "function": "unpack_clear"
        },
        "id": "CVE-2026-57585-9e8aaf65",
        "signature_type": "Function",
        "deprecated": false,
        "source": "https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d",
        "signature_version": "v1",
        "digest": {
            "function_hash": "317986275632129119767815112729584778371",
            "length": 310.0
        }
    }
]
source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-57585.json"
vanir_signatures_modified 
"2026-07-14T20:06:34Z"