CVE-2026-9669

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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."}, {"lang": "es", "value": "Los objetos bz2.BZ2Decompressor podr\u00edan reutilizarse despu\u00e9s de un error de descompresi\u00f3n. Si una aplicaci\u00f3n capturaba el OSError resultante y reintentaba con el mismo descompresor, una entrada manipulada podr\u00eda hacer que el descompresor reanudara desde un estado interno no v\u00e1lido y realizara escrituras fuera de l\u00edmites en un b\u00fafer de pila. Esto podr\u00eda bloquear el proceso al procesar datos no confiables."}], "id": "CVE-2026-9669", "lastModified": "2026-11-10T13:19:42.023", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@python.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-9669", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-16T12:23:25.378543Z", "version": "2.0.3"}}]}, "published": "2026-06-08T23:17:25.170", "references": [{"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/157a5df8cb5d82b33f918a7489e72ce95ceb12b6"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/1ba6135eae75ad8413413caeeedb56ae72320636"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/5755d0f083949ff3c5bf3a37e673e24e306b036e"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/619a12b2e545391dc436b3af79dda22337382a6f"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/938ec030e90c5e53f1faac6fab1643f14e4f4a79"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/991e6cf86496718c4ef00b362d640e00cb5c85b2"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/commit/d3ca26983dfbccdf609f24ff5877dc3118e4702d"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/issues/150599"}, {"source": "cna@python.org", "url": "https://github.com/python/cpython/pull/150600"}, {"source": "cna@python.org", "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/DBJZETMGUIFK7DVUWMOXHD3Z6IX2QPSX/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/06/08/17"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "cna@python.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "cna@python.org", "type": "Secondary"}]}

{"bugzilla": {"description": "python: Python: Denial of Service via out-of-bounds write in BZ2 decompression", "id": "2486590", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486590"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["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.", "A flaw was found in Python's `bz2.BZ2Decompressor` component. An attacker could provide specially crafted input that, when processed by an application reusing a decompressor object after an error, could lead to out-of-bounds writes in memory. This memory corruption could cause the application to crash, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Applications processing untrusted BZ2 compressed data should avoid reusing `bz2.BZ2Decompressor` objects after a decompression error. Instead, a new `bz2.BZ2Decompressor` instance should be created for each new decompression attempt or after an error occurs. This prevents the decompressor from resuming from an invalid internal state."}, "name": "CVE-2026-9669", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "python36", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2026-06-08T22:01:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-9669\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-9669\nhttps://github.com/python/cpython/issues/150599\nhttps://github.com/python/cpython/pull/150600\nhttps://mail.python.org/archives/list/security-announce@python.org/thread/DBJZETMGUIFK7DVUWMOXHD3Z6IX2QPSX/"], "statement": "This Moderate-impact flaw in Python's `bz2.BZ2Decompressor` component affects Red Hat Enterprise Linux 8. It allows an attacker to trigger a denial of service by providing specially crafted compressed data. Exploitation requires an application to reuse a `BZ2Decompressor` object after a decompression error, leading to out-of-bounds writes and a crash.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.16.0)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "CPython", "source": "cna", "vendor": "Python Software Foundation"}, "product": "cpython", "vendor": "python"}], "created": "2026-06-08T23:30:16.415198+00:00", "updated": "2026-06-17T23:45:13.990120+00:00", "vendors": ["python", "python$PRODUCT$cpython"]}