{
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    "cveMetadata": {
        "cveId": "CVE-2026-9669",
        "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "state": "PUBLISHED",
        "assignerShortName": "PSF",
        "dateReserved": "2026-05-27T03:13:18.152Z",
        "datePublished": "2026-06-08T22:01:15.420Z",
        "dateUpdated": "2026-06-16T12:23:44.258Z"
    },
    "containers": {
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                {
                    "defaultStatus": "unaffected",
                    "modules": [
                        "bz2"
                    ],
                    "product": "CPython",
                    "repo": "https://github.com/python/cpython",
                    "vendor": "Python Software Foundation",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "3.13.14",
                            "status": "affected",
                            "versionType": "python"
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                            "version": "3.14.0",
                            "lessThan": "3.14.6",
                            "status": "affected",
                            "versionType": "python"
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                            "version": "3.15.0a1",
                            "lessThan": "3.15.0",
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                            "versionType": "python"
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            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Bitshift (https://github.com/TheShiftedBit)"
                },
                {
                    "lang": "en",
                    "type": "coordinator",
                    "value": "Emma Smith (https://github.com/emmatyping)"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "Stan Ulbrych (https://github.com/StanFromIreland)"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "Serhiy Storchaka (https://github.com/serhiy-storchaka)"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "value": "bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash the process when processing untrusted data."
                        }
                    ],
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                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "HIGH",
                        "attackRequirements": "PRESENT",
                        "attackVector": "NETWORK",
                        "baseScore": 8.2,
                        "baseSeverity": "HIGH",
                        "exploitMaturity": "NOT_DEFINED",
                        "privilegesRequired": "NONE",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0",
                        "vulnAvailabilityImpact": "HIGH",
                        "vulnConfidentialityImpact": "NONE",
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                        "vulnerabilityResponseEffort": "NOT_DEFINED"
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                            "lang": "en",
                            "value": "GENERAL"
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            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-121",
                            "description": "CWE-121 Stack-based buffer overflow",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
                "shortName": "PSF",
                "dateUpdated": "2026-06-10T18:57:19.975Z"
            },
            "references": [
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/python/cpython/pull/150600"
                },
                {
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/DBJZETMGUIFK7DVUWMOXHD3Z6IX2QPSX/"
                },
                {
                    "tags": [
                        "issue-tracking"
                    ],
                    "url": "https://github.com/python/cpython/issues/150599"
                },
                {
                    "tags": [
                        "patch"
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                    "url": "https://github.com/python/cpython/commit/157a5df8cb5d82b33f918a7489e72ce95ceb12b6"
                },
                {
                    "tags": [
                        "patch"
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                    "url": "https://github.com/python/cpython/commit/5755d0f083949ff3c5bf3a37e673e24e306b036e"
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                    "tags": [
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                    "url": "https://github.com/python/cpython/commit/d3ca26983dfbccdf609f24ff5877dc3118e4702d"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "bz2.BZ2Decompressor reuse after error can cause a stack buffer overflow",
            "x_generator": {
                "engine": "cvelib 1.8.0"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/06/08/17"
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                "metrics": [
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                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-16T12:23:25.378543Z",
                                "id": "CVE-2026-9669",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
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                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
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                                "role": "CISA Coordinator",
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                "title": "CISA ADP Vulnrichment",
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}