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{"bugzilla": {"description": "aiohttp: AIOHTTP: Denial of Service via excessive pipelined requests", "id": "2491464", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491464"}, "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-770", "details": ["A flaw was found in AIOHTTP, an asynchronous HTTP client/server framework for asyncio and Python. An attacker could exploit this vulnerability by sending an unlimited number of pipelined requests, causing the system to consume excessive amounts of memory. This could lead to a Denial of Service (DoS), making the affected system unavailable to legitimate users."], "mitigation": {"lang": "en:us", "value": "Update the aiohttp package to version 3.14.1 or later.\nUntil updated builds are available for a given product, reduce exposure by not exposing aiohttp-based HTTP/1 servers directly to untrusted networks. A reverse proxy in front of the service can help limit abusive pipelined request patterns. Installations that use aiohttp only as an HTTP client, or that do not accept HTTP/1 pipelined requests on an aiohttp server, are not affected by this flaw."}, "name": "CVE-2026-54273", "package_state": [{"cpe": "cpe:/a:redhat:exploit_intelligence:0", "fix_state": "Out of support scope", "package_name": "exploit-intelligence-tech-preview/vulnerability-analysis-rhel9", "product_name": "Exploit Intelligence"}, {"cpe": "cpe:/a:redhat:migration_toolkit_applications:8", "fix_state": "Fix deferred", "package_name": "mta/mta-solution-server-rhel9", "product_name": "Migration Toolkit for Applications 8"}, {"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": "Fix deferred", "package_name": "openshift-lightspeed/lightspeed-service-api-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": 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"product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "python-aiohttp-xmlrpc", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "satellite-capsule:el8/python-aiohttp", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "satellite:el8/python-aiohttp", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "satellite:el8/python-aiohttp-xmlrpc", "product_name": "Red Hat Satellite 6"}, {"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"}, {"cpe": "cpe:/a:redhat:rhui:4::el8", "fix_state": "Not affected", "package_name": "python-aiohttp", "product_name": "Red Hat Update Infrastructure 4 for Cloud Providers"}, {"cpe": "cpe:/a:redhat:rhui:4::el8", "fix_state": "Not affected", "package_name": "python-aiohttp-xmlrpc", "product_name": "Red Hat Update Infrastructure 4 for Cloud Providers"}], "public_date": "2026-06-22T16:41:20Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-54273\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-54273\nhttps://github.com/aio-libs/aiohttp/commit/dfdfa9d5aad5d21f91c79fb2ceeba0f8046cb6cf\nhttps://github.com/aio-libs/aiohttp/security/advisories/GHSA-4fvr-rgm6-gqmc"], "statement": "This vulnerability is rated Moderate because an unauthenticated remote attacker can trigger denial of service against an affected aiohttp HTTP/1 server by sending a large number of pipelined requests, causing excessive memory consumption. Exploitation requires aiohttp to be deployed as an HTTP/1 server that accepts pipelined requests from untrusted clients.\nMany Red Hat products ship aiohttp as a bundled dependency for client libraries, internal automation, or services that do not expose this server behavior to untrusted users. In those configurations, practical risk may be lower, but affected packages should still be updated to aiohttp 3.14.1 or later when fixes are released.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.14.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "aiohttp", "source": "cna", "vendor": "aio-libs"}, "product": "aiohttp", "vendor": "aio-libs"}], "created": "2026-06-22T18:30:15.398730+00:00", "updated": "2026-06-22T20:00:06.001535+00:00", "vendors": ["aio-libs", "aio-libs$PRODUCT$aiohttp"]}