{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-84382", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-01T16:27:58.130Z", "datePublished": "2026-09-02T18:03:05.010Z", "dateUpdated": "2026-09-02T18:03:05.010Z"}, "containers": {"cna": {"title": "HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)", "problemTypes": [{"descriptions": [{"cweId": "CWE-409", "lang": "en", "description": "CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/pydantic/httpx2/security/advisories/GHSA-8xx6-hgc6-gc2m", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-8xx6-hgc6-gc2m"}, {"name": "https://github.com/pydantic/httpx2/pull/1126", "tags": ["x_refsource_MISC"], "url": "https://github.com/pydantic/httpx2/pull/1126"}, {"name": "https://github.com/pydantic/httpx2/commit/4fd0c70a3f207c618b145934792f791bccfb39f8", "tags": ["x_refsource_MISC"], "url": "https://github.com/pydantic/httpx2/commit/4fd0c70a3f207c618b145934792f791bccfb39f8"}, {"name": "https://github.com/pydantic/httpx2/releases/tag/v2.12.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/pydantic/httpx2/releases/tag/v2.12.0"}], "affected": [{"vendor": "pydantic", "product": "httpx2", "versions": [{"version": "< 2.12.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-02T18:03:05.010Z"}, "descriptions": [{"lang": "en", "value": "HTTPX2 is a next generation HTTP client for Python. Prior to 2.12.0, the HTTPX2 content decoders in src/httpx2/httpx2/_decoders.py fully inflate each gzip, deflate, br, or zstd network chunk before iter_bytes() or aiter_bytes() yields bounded pieces to the application. A 64 KiB compressed chunk can expand to approximately 64 MiB in one intermediate allocation, so an attacker-controlled or compromised server can cause severe memory pressure or out-of-memory process termination even when the application streams the response. This issue is fixed in version 2.12.0."}], "source": {"advisory": "GHSA-8xx6-hgc6-gc2m", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "httpx2", "vendor": "pydantic", "versions": [{"status": "affected", "version": "< 2.12.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "HTTPX2 is a next generation HTTP client for Python. Prior to 2.12.0, the HTTPX2 content decoders in src/httpx2/httpx2/_decoders.py fully inflate each gzip, deflate, br, or zstd network chunk before iter_bytes() or aiter_bytes() yields bounded pieces to the application. A 64 KiB compressed chunk can expand to approximately 64 MiB in one intermediate allocation, so an attacker-controlled or compromised server can cause severe memory pressure or out-of-memory process termination even when the application streams the response. This issue is fixed in version 2.12.0."}], "id": "CVE-2026-84382", "lastModified": "2026-09-02T19:18:08.353", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-02T19:18:08.353", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/commit/4fd0c70a3f207c618b145934792f791bccfb39f8"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/pull/1126"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/releases/tag/v2.12.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-8xx6-hgc6-gc2m"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-409"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

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