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{"bugzilla": {"description": "aiohttp: AIOHTTP: Denial of Service via excessive multipart headers", "id": "2454112", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454112"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/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 asyncio and Python. A remote attacker could exploit this vulnerability by sending a response with an excessive number of multipart headers. This could cause the system to consume more memory than intended, leading to a Denial of Service (DoS) condition."], "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-2026-34516", "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": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": 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"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": "2026-04-01T20:13:04Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34516\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34516\nhttps://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f\nhttps://github.com/aio-libs/aiohttp/releases/tag/v3.13.4\nhttps://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647"], "statement": "The availability impact of this flaw does not pose a risk to host Red Hat systems.", "threat_severity": "Moderate"}

{"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": "2026-04-02T02:41:13.246033+00:00", "value": {"mitigation_remediation": ["Upgrade aiohttp to 3.13.4 or later. ", "If an immediate upgrade is not possible, implement monitoring and throttling of incoming requests with unusually large multipart header counts."], "summary": {"action": "Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects all releases of aio-libs aiohttp older than version 3.13.4. The fix was introduced in v3.13.4, which validates multipart header counts before processing.\n", "description_and_impact": "AIOHTTP allows an attacker to send a response with an excessive number of multipart headers. Because the framework does not enforce a limit, it allocates memory proportional to the header count, leading to possible memory exhaustion and a denial\u2011of\u2011service condition.\nThe defect is a memory allocation flaw as identified by CWE\u2011770.\n", "risk_and_exploitability": "The CVSS score of 6.6 indicates moderate severity, and no EPSS score is available. The vulnerability is not listed in the CISA KEV catalog.\nThe likely attack vector is inferred from the description: an attacker would send a crafted HTTP response containing thousands of multipart headers to a server running an affected aiohttp instance, which is feasible over the network and does not require local code execution.\n"}}}}, "created": "2026-04-02T07:47:48.700477+00:00", "updated": "2026-04-02T20:16:42.737355+00:00", "vendors": ["aio-libs", "aio-libs$PRODUCT$aiohttp"]}