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{"bugzilla": {"description": "aiohttp: AIOHTTP: Denial of Service via large multipart form fields", "id": "2454095", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454095"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in AIOHTTP, an asynchronous HTTP client/server framework for Python. A remote attacker could exploit this vulnerability by sending a specially crafted multipart form field. The framework would read the entire field into memory before enforcing size limits, potentially leading to excessive memory consumption and a Denial of Service (DoS) for the affected system."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-34517", "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:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/rag-tool-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed/lightspeed-ocp-rag-rhel9", "product_name": 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"rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-workbench-jupyter-tensorflow-rocm-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-insights-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vulnerability-engine-rhel9", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-04-01T20:14:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34517\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34517\nhttps://github.com/aio-libs/aiohttp/commit/cbb774f38330563422ca0c413a71021d7b944145\nhttps://github.com/aio-libs/aiohttp/releases/tag/v3.13.4\nhttps://github.com/aio-libs/aiohttp/security/advisories/GHSA-3wq7-rqq7-wx6j"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.13.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "product": "aiohttp", "vendor": "aio-libs"}], "analysis": {"en": {"generated_at": "2026-04-02T02:41:06.326755+00:00", "value": {"mitigation_remediation": ["Upgrade aiohttp to version 3.13.4 or later", "Configure the server\u2019s client_max_size setting to an appropriate limit", "Verify that all applications using aiohttp have been updated"], "summary": {"action": "Patch", "impact": "Memory DoS"}, "threat_synthesis": {"affected_systems": "The vulnerable component is the aio-libs aiohttp framework. All installations of aiohttp prior to version 3.13.4 are affected. Applications that expose HTTP endpoints using this library, whether as a web framework or as an HTTP client handling multipart data, are at risk.", "description_and_impact": "AIOHTTP reads entire multipart form data fields into memory before validating them against the configured client_max_size limit. This behavior enables an attacker to submit overly large fields that consume excessive server memory, causing performance degradation or a crash and resulting in a denial of service for legitimate users. The impact is a resource exhaustion vulnerability classified under CWE\u2011770 with a CVSS score of 2.7.", "risk_and_exploitability": "Based on the description, it is inferred that an attacker can remotely send specially crafted HTTP requests to a server that uses a vulnerable aiohttp instance. The low CVSS score and the absence of an EPSS metric suggest a moderate overall risk, but the lack of a current Public Exploit Means the threat is likely limited to environments where the server accepts multipart form data. The vulnerability is not listed in CISA\u2019s KEV catalog, indicating no known large\u2011scale exploitation. Nevertheless, when a single client can exhaust server memory, the denial of service impact can be significant for critical services."}}}}, "created": "2026-04-02T07:47:47.633212+00:00", "updated": "2026-04-02T20:16:41.811864+00:00", "vendors": ["aio-libs", "aio-libs$PRODUCT$aiohttp"]}