{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-84378", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-01T16:27:58.130Z", "datePublished": "2026-09-02T17:54:19.431Z", "dateUpdated": "2026-09-02T19:00:24.511Z"}, "containers": {"cna": {"title": "HTTPX2: Quadratic SSE line buffering can cause CPU denial of service", "problemTypes": [{"descriptions": [{"cweId": "CWE-407", "lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/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-f2fp-rgf2-35cp", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-f2fp-rgf2-35cp"}, {"name": "https://github.com/pydantic/httpx2/pull/1071", "tags": ["x_refsource_MISC"], "url": "https://github.com/pydantic/httpx2/pull/1071"}, {"name": "https://github.com/pydantic/httpx2/pull/1117", "tags": ["x_refsource_MISC"], "url": "https://github.com/pydantic/httpx2/pull/1117"}, {"name": "https://github.com/pydantic/httpx2/commit/cbfc0e04ef6507da29ccbb3b9c2e5b23dd693414", "tags": ["x_refsource_MISC"], "url": "https://github.com/pydantic/httpx2/commit/cbfc0e04ef6507da29ccbb3b9c2e5b23dd693414"}, {"name": "https://github.com/pydantic/httpx2/releases/tag/v2.10.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/pydantic/httpx2/releases/tag/v2.10.0"}], "affected": [{"vendor": "pydantic", "product": "httpx2", "versions": [{"version": ">= 2.5.0, < 2.10.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-02T17:54:19.431Z"}, "descriptions": [{"lang": "en", "value": "HTTPX2 is a next generation HTTP client for Python. From 2.5.0 until 2.10.0, the HTTPX2 Server-Sent Events parser in src/httpx2/httpx2/_sse.py repeatedly copies and rescans buffered text in _SSELineDecoder.decode() when an attacker-controlled or compromised SSE endpoint splits one unterminated line across many response chunks. The behavior affects httpx2.Client.sse() and httpx2.AsyncClient.sse(), and the total processing work grows quadratically with the line length, allowing a crafted stream to consume excessive CPU and block a synchronous worker or asynchronous event loop. This issue is fixed in version 2.10.0."}], "source": {"advisory": "GHSA-f2fp-rgf2-35cp", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-02T19:00:16.905501Z", "id": "CVE-2026-84378", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-02T19:00:24.511Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-84378", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-02T19:00:16.905501Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-02T19:00:21.442Z"}}], "cna": {"title": "HTTPX2: Quadratic SSE line buffering can cause CPU denial of service", "source": {"advisory": "GHSA-f2fp-rgf2-35cp", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "pydantic", "product": "httpx2", "versions": [{"status": "affected", "version": ">= 2.5.0, < 2.10.0"}]}], "references": [{"url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-f2fp-rgf2-35cp", "name": "https://github.com/pydantic/httpx2/security/advisories/GHSA-f2fp-rgf2-35cp", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/pydantic/httpx2/pull/1071", "name": "https://github.com/pydantic/httpx2/pull/1071", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/pydantic/httpx2/pull/1117", "name": "https://github.com/pydantic/httpx2/pull/1117", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/pydantic/httpx2/commit/cbfc0e04ef6507da29ccbb3b9c2e5b23dd693414", "name": "https://github.com/pydantic/httpx2/commit/cbfc0e04ef6507da29ccbb3b9c2e5b23dd693414", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/pydantic/httpx2/releases/tag/v2.10.0", "name": "https://github.com/pydantic/httpx2/releases/tag/v2.10.0", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "HTTPX2 is a next generation HTTP client for Python. From 2.5.0 until 2.10.0, the HTTPX2 Server-Sent Events parser in src/httpx2/httpx2/_sse.py repeatedly copies and rescans buffered text in _SSELineDecoder.decode() when an attacker-controlled or compromised SSE endpoint splits one unterminated line across many response chunks. The behavior affects httpx2.Client.sse() and httpx2.AsyncClient.sse(), and the total processing work grows quadratically with the line length, allowing a crafted stream to consume excessive CPU and block a synchronous worker or asynchronous event loop. This issue is fixed in version 2.10.0."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-407", "description": "CWE-407: Inefficient Algorithmic Complexity"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-02T17:54:19.431Z"}}}, "cveMetadata": {"cveId": "CVE-2026-84378", "state": "PUBLISHED", "dateUpdated": "2026-09-02T19:00:24.511Z", "dateReserved": "2026-09-01T16:27:58.130Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-09-02T17:54:19.431Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "httpx2", "vendor": "pydantic", "versions": [{"status": "affected", "version": ">= 2.5.0, < 2.10.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "HTTPX2 is a next generation HTTP client for Python. From 2.5.0 until 2.10.0, the HTTPX2 Server-Sent Events parser in src/httpx2/httpx2/_sse.py repeatedly copies and rescans buffered text in _SSELineDecoder.decode() when an attacker-controlled or compromised SSE endpoint splits one unterminated line across many response chunks. The behavior affects httpx2.Client.sse() and httpx2.AsyncClient.sse(), and the total processing work grows quadratically with the line length, allowing a crafted stream to consume excessive CPU and block a synchronous worker or asynchronous event loop. This issue is fixed in version 2.10.0."}], "id": "CVE-2026-84378", "lastModified": "2026-09-02T19:18:07.907", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-84378", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-02T19:00:16.905501Z", "version": "2.0.3"}}]}, "published": "2026-09-02T18:21:29.153", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/commit/cbfc0e04ef6507da29ccbb3b9c2e5b23dd693414"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/pull/1071"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/pull/1117"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/releases/tag/v2.10.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-f2fp-rgf2-35cp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "httpx2: HTTPX2: Denial of Service via crafted Server-Sent Events stream", "id": "2527694", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2527694"}, "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-606", "details": ["A flaw was found in httpx2, a Python HTTP client. The Server-Sent Events (SSE) parser in httpx2 can be exploited by a remote attacker. By sending a specially crafted stream where an unterminated line is split across many response chunks, the parser repeatedly copies and rescans buffered text. This quadratic processing work consumes excessive CPU resources, leading to a Denial of Service (DoS) by blocking synchronous workers or asynchronous event loops."], "name": "CVE-2026-84378", "package_state": [{"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/lightspeed-stack-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-automl-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-kserve-autogluon-server-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-kserve-storage-initializer-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-09-02T17:54:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-84378\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-84378\nhttps://github.com/pydantic/httpx2/commit/cbfc0e04ef6507da29ccbb3b9c2e5b23dd693414\nhttps://github.com/pydantic/httpx2/pull/1071\nhttps://github.com/pydantic/httpx2/pull/1117\nhttps://github.com/pydantic/httpx2/releases/tag/v2.10.0\nhttps://github.com/pydantic/httpx2/security/advisories/GHSA-f2fp-rgf2-35cp"], "threat_severity": "Moderate"}

{"created": "2026-09-03T09:45:03.891112+00:00", "updated": "2026-09-03T14:00:04.976790+00:00", "vendors": []}