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{"bugzilla": {"description": "aiohttp: aiohttp: Security bypass via multiple Host headers", "id": "2454096", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454096"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["A flaw was found in aiohttp, an asynchronous HTTP client/server framework for Python. This vulnerability allows a remote attacker to send multiple Host headers in a single request. This can lead to unexpected behavior, potentially bypassing security controls or causing cache poisoning, which may result in integrity issues."], "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-2026-34525", "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": 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"Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-workbench-jupyter-minimal-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-minimal-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-pytorch-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-pytorch-llmcompressor-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-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": "2026-04-01T20:28:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34525\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34525\nhttps://github.com/aio-libs/aiohttp/commit/53e2e6fc58b89c6185be7820bd2c9f40216b3000\nhttps://github.com/aio-libs/aiohttp/commit/e00ca3cca92c465c7913c4beb763a72da9ed8349\nhttps://github.com/aio-libs/aiohttp/releases/tag/v3.13.4\nhttps://github.com/aio-libs/aiohttp/security/advisories/GHSA-c427-h43c-vf67"], "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": "2026-04-02T02:23:34.511935+00:00", "value": {"mitigation_remediation": ["Upgrade aiohttp to version 3.13.4 or later.", "Confirm that the server configuration rejects duplicate Host headers or enforces strict header parsing.", "Monitor inbound HTTP traffic for suspicious duplicate Host header patterns as a potential probing indicator.", "If an upgrade cannot occur immediately, use a reverse proxy or firewall rule to strip or block requests containing multiple Host headers."], "summary": {"action": "Immediate Patch", "impact": "Header Manipulation leading to request misrouting"}, "threat_synthesis": {"affected_systems": "This flaw exists in the aio-libs aiohttp asynchronous HTTP framework. Any installation running a version earlier than 3.13.4 is affected. The official fix is provided in the aiohttp release 3.13.4, so systems using older releases should be patched to that version or newer.", "description_and_impact": "The vulnerability in aiohttp allows an attacker to send HTTP requests containing multiple Host headers. The server accepts and processes all header instances rather than rejecting duplicates, creating ambiguity in request handling. This weakness, identified as CWE-20 (Improper Input Validation) and CWE-444 (URL Filtering Weaknesses), can enable an attacker to manipulate the perceived target host of a request, potentially resulting in request smuggling, service degradation, or unintended data disclosure.", "risk_and_exploitability": "With a CVSS score of 6.3 the vulnerability is considered moderate in severity. The EPSS score is not reported and the flaw is not listed in the CISA Known Exploited Vulnerabilities catalog, so there is no confirmed exploitation data. However, the attack vector is network based; an adversary only needs the ability to send a specially crafted HTTP request to a reachable aiohttp service, which makes exploitation reasonably likely for publicly exposed instances. The lack of privileged requirements further raises the practical risk for affected environments."}}}}, "created": "2026-04-02T07:47:43.522593+00:00", "updated": "2026-04-02T20:16:38.131746+00:00", "vendors": ["aio-libs", "aio-libs$PRODUCT$aiohttp"]}