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{"bugzilla": {"description": "aiohttp: AIOHTTP: Header injection vulnerability due to improper character handling", "id": "2454094", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454094"}, "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:L/A:N", "status": "draft"}, "cwe": "CWE-1286", "details": ["A flaw was found in AIOHTTP, an asynchronous HTTP client/server framework for Python. The default C parser incorrectly processed null bytes and control characters present in HTTP response headers. This vulnerability could allow a remote attacker to inject malicious data into these headers, potentially leading to unexpected application behavior or security bypasses."], "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-2026-34520", "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"}, 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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": "2026-04-01T20:27:48Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34520\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34520\nhttps://github.com/aio-libs/aiohttp/commit/9370b9714a7a56003cacd31a9b4ae16eab109ba4\nhttps://github.com/aio-libs/aiohttp/releases/tag/v3.13.4\nhttps://github.com/aio-libs/aiohttp/security/advisories/GHSA-63hf-3vf5-4wqf"], "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": "2026-04-02T02:40:59.542472+00:00", "value": {"mitigation_remediation": ["Upgrade aiohttp to version 3.13.4 or later", "If an upgrade is not immediately possible, validate and sanitize all HTTP response header values before processing to eliminate null bytes and control characters"], "summary": {"action": "Patch", "impact": "Header Injection / Security Bypass"}, "threat_synthesis": {"affected_systems": "AIOHTTP releases prior to version 3.13.4 are affected when using the default C parser. This applies to all installations that rely on the C based parser for HTTP response parsing.", "description_and_impact": "The vulnerability in AIOHTTP's default C parser allows the inclusion of null bytes and control characters in response header values, enabling header injection and potential security bypass. This improper handling of header data aligns with CWE\u2011113 (HTTP Response Splitting) and CWE\u20111286 (Control characters in header values), and can lead to protocol manipulation or unintended response behavior.", "risk_and_exploitability": "With a CVSS score of 2.7, the vulnerability carries a low impact assessment and no publicly available EPSS data suggests widespread exploitation. Attackers could remotely craft responses containing null or control characters, but success relies on the vulnerable parser and does not typically lead to high\u2011severity outcomes unless combined with other weaknesses."}}}}, "created": "2026-04-02T07:47:44.641488+00:00", "updated": "2026-04-02T20:16:39.084750+00:00", "vendors": ["aio-libs", "aio-libs$PRODUCT$aiohttp"]}