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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "node", "vendor": "nodejs", "versions": [{"lessThanOrEqual": "26.5.0", "status": "affected", "version": "26.5.0", "versionType": "semver"}, {"lessThanOrEqual": "24.18.0", "status": "affected", "version": "24.18.0", "versionType": "semver"}, {"lessThanOrEqual": "22.23.1", "status": "affected", "version": "22.23.1", "versionType": "semver"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw in Node.js HTTP/2 handling allows `nghttp2_session_mem_send()` to be called re-entrantly while `nghttp2_session_mem_recv()` is executing, resulting in a heap-use-after-free.\r\n\r\nThis vulnerability affects Node.js **26.x**, **24.x**, and **22.x**."}], "id": "CVE-2026-56848", "lastModified": "2026-08-04T18:16:53.500", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "[email protected]", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-56848", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-04T17:35:44.952267Z", "version": "2.0.3"}}]}, "published": "2026-08-04T17:16:56.207", "references": [{"source": "[email protected]", "url": "https://nodejs.org/en/blog/vulnerability/july-2026-security-releases"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "[email protected]", "type": "Secondary"}]}

{"bugzilla": {"description": "nodejs: Node.js: Heap-use-after-free in HTTP/2 handling can lead to denial of service", "id": "2511089", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511089"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A heap use-after-free vulnerability in the Node.js HTTP/2 component allows a remote attacker to crash the application, causing a denial of service. This is triggered by an unexpected re-entrant call to nghttp2_session_mem_send() while nghttp2_session_mem_recv() is still executing."], "mitigation": {"lang": "en:us", "value": "Restrict network access to Node.js HTTP/2 listeners to trusted clients only. If HTTP/2 is not required, disable it to remove the vulnerable handler from the attack surface."}, "name": "CVE-2026-56848", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "nodejs22", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "nodejs24", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nodejs:22/nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nodejs:24/nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "nodejs20", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "nodejs22", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "nodejs24", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "nodejs25", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "nodejs26", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-08-04T15:57:24Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-56848\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-56848\nhttps://nodejs.org/en/blog/vulnerability/july-2026-security-releases"], "statement": "A remote attacker can exploit an Important heap use-after-free vulnerability in Node.js HTTP/2 to crash applications. The flaw, caused by re-entrant memory operations, leads to a denial of service for Red Hat environments with HTTP/2 enabled.", "threat_severity": "Important"}

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