{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-21713", "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "state": "PUBLISHED", "assignerShortName": "hackerone", "dateReserved": "2026-01-04T15:00:06.574Z", "datePublished": "2026-03-30T19:07:28.356Z", "dateUpdated": "2026-05-10T13:17:50.281Z"}, "containers": {"cna": {"descriptions": [{"lang": "en", "value": "A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior could be exploited as a timing oracle to infer HMAC values.\r\n\r\nNode.js already provides timing-safe comparison primitives used elsewhere in the codebase, indicating this is an oversight rather than an intentional design decision.\r\n\r\nThis vulnerability affects **20.x, 22.x, 24.x, and 25.x**."}], "affected": [{"defaultStatus": "unaffected", "vendor": "nodejs", "product": "node", "versions": [{"version": "20.20.1", "status": "affected", "lessThanOrEqual": "20.20.1", "versionType": "semver"}, {"version": "22.22.1", "status": "affected", "lessThanOrEqual": "22.22.1", "versionType": "semver"}, {"version": "24.14.0", "status": "affected", "lessThanOrEqual": "24.14.0", "versionType": "semver"}, {"version": "25.8.1", "status": "affected", "lessThanOrEqual": "25.8.1", "versionType": "semver"}, {"version": "4.0", "status": "affected", "lessThan": "4.*", "versionType": "semver"}, {"version": "5.0", "status": "affected", "lessThan": "5.*", "versionType": "semver"}, {"version": "6.0", "status": "affected", "lessThan": "6.*", "versionType": "semver"}, {"version": "7.0", "status": "affected", "lessThan": "7.*", "versionType": "semver"}, {"version": "8.0", "status": "affected", "lessThan": "8.*", "versionType": "semver"}, {"version": "9.0", "status": "affected", "lessThan": "9.*", "versionType": "semver"}, {"version": "10.0", "status": "affected", "lessThan": "10.*", "versionType": "semver"}, {"version": "11.0", "status": "affected", "lessThan": "11.*", "versionType": "semver"}, {"version": "12.0", "status": "affected", "lessThan": "12.*", "versionType": "semver"}, {"version": "13.0", "status": "affected", "lessThan": "13.*", "versionType": "semver"}, {"version": "14.0", "status": "affected", "lessThan": "14.*", "versionType": "semver"}, {"version": "15.0", "status": "affected", "lessThan": "15.*", "versionType": "semver"}, {"version": "16.0", "status": "affected", "lessThan": "16.*", "versionType": "semver"}, {"version": "17.0", "status": "affected", "lessThan": "17.*", "versionType": "semver"}, {"version": "18.0", "status": "affected", "lessThan": "18.*", "versionType": "semver"}, {"version": "19.0", "status": "affected", "lessThan": "19.*", "versionType": "semver"}]}], "references": [{"url": "https://nodejs.org/en/blog/vulnerability/march-2026-security-releases"}], "metrics": [{"cvssV3_0": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.9, "baseSeverity": "MEDIUM"}}], "providerMetadata": {"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "shortName": "hackerone", "dateUpdated": "2026-03-30T19:07:28.356Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-208", "lang": "en", "description": "CWE-208 Observable Timing Discrepancy"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-30T19:45:13.027379Z", "id": "CVE-2026-21713", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-10T13:17:50.281Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior could be exploited as a timing oracle to infer HMAC values.\r\n\r\nNode.js already provides timing-safe comparison primitives used elsewhere in the codebase, indicating this is an oversight rather than an intentional design decision.\r\n\r\nThis vulnerability affects **20.x, 22.x, 24.x, and 25.x**."}, {"lang": "es", "value": "Un fallo en la verificaci\u00f3n HMAC de Node.js utiliza una comparaci\u00f3n de tiempo no constante al validar firmas proporcionadas por el usuario, filtrando potencialmente informaci\u00f3n de temporizaci\u00f3n proporcional al n\u00famero de bytes coincidentes. Bajo ciertos modelos de amenaza donde las mediciones de temporizaci\u00f3n de alta resoluci\u00f3n son posibles, este comportamiento podr\u00eda ser explotado como un or\u00e1culo de temporizaci\u00f3n para inferir valores HMAC.\n\nNode.js ya proporciona primitivas de comparaci\u00f3n seguras contra ataques de temporizaci\u00f3n utilizadas en otras partes de la base de c\u00f3digo, lo que indica que esto es un descuido en lugar de una decisi\u00f3n de dise\u00f1o intencional.\n\nEsta vulnerabilidad afecta 20.x, 22.x, 24.x y 25.x."}], "id": "CVE-2026-21713", "lastModified": "2026-05-10T14:16:47.507", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.0"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "support@hackerone.com", "type": "Secondary"}]}, "published": "2026-03-30T20:16:19.397", "references": [{"source": "support@hackerone.com", "url": "https://nodejs.org/en/blog/vulnerability/march-2026-security-releases"}], "sourceIdentifier": "support@hackerone.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-208"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "Node.js: Node.js: Information disclosure via timing oracle in HMAC verification", "id": "2453160", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453160"}, "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:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-208", "details": ["A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possible, this behavior could be exploited as a timing oracle to infer HMAC values.\nNode.js already provides timing-safe comparison primitives used elsewhere in the codebase, indicating this is an oversight rather than an intentional design decision.\nThis vulnerability affects **20.x, 22.x, 24.x, and 25.x**.", "A flaw was found in Node.js. The HMAC (Hash-based Message Authentication Code) verification process uses a comparison method that does not take a constant amount of time. This non-constant-time comparison can leak timing information, which, under specific conditions where precise timing measurements are possible, could be exploited by a remote attacker. This allows the attacker to infer sensitive HMAC values, leading to information disclosure."], "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-2026-21713", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "nodejs22", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "nodejs24", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "nodejs:20/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "nodejs:22/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "nodejs:24/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nodejs:20/nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nodejs:22/nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nodejs:24/nodejs", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-30T19:07:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-21713\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-21713\nhttps://nodejs.org/en/blog/vulnerability/march-2026-security-releases"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[20.20.1,20.20.1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[22.22.1,22.22.1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[24.14.0,24.14.0]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[25.8.1,25.8.1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,9.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,10.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,11.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,12.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,13.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,14.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,15.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,16.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,17.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,18.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,19.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,20.0.0)"}}], "enrichment": {"confidence": 92.0, "confidence_source": "matching", "scores": [{"score": 92.0, "source": "matching"}]}, "original": {"product": "node", "source": "cna", "vendor": "nodejs"}, "product": "nodejs", "vendor": "nodejs"}], "analysis": {"en": {"generated_at": "2026-04-02T23:53:47.036165+00:00", "value": {"mitigation_remediation": ["Update Node.js to the latest release from the March\u00a02026 security update series, which replaces the faulty comparison with a true constant\u2011time implementation.", "Verify that the upgraded Node.js binary is actively in use and redeploy affected applications that previously relied on older Node.js versions.", "If a patch cannot be applied immediately, temporarily disable or bypass any functionality that performs HMAC verification, or isolate the service to a network boundary that limits precise timing access.", "Regularly monitor Node.js security advisories and incorporate version checks into deployment pipelines to prevent regression to vulnerable releases."], "summary": {"action": "Apply Patch", "impact": "Information Disclosure via Timing Oracle"}, "threat_synthesis": {"affected_systems": "Node.js releases 20.x, 22.x, 24.x, and 25.x are affected. Deployments that run any of these major versions and perform HMAC verification on externally supplied data are potentially vulnerable until remedied.", "description_and_impact": "A flaw in Node.js HMAC verification performs a non\u2011constant\u2011time comparison when validating user-supplied signatures, leaking timing information proportional to the number of matching bytes. This timing side channel can be used as a timing oracle to infer the correct HMAC value byte by byte. The weakness corresponds to a classic timing attack, identified as CWE\u2011208.", "risk_and_exploitability": "The CVSS score of 5.9 indicates a moderate severity, and the EPSS score of less than 1% suggests a low likelihood of exploitation. The vulnerability is not listed in the CISA KeV catalog. Exploitation requires an attacker to be able to make high\u2011resolution timing measurements against an endpoint that accepts signed data; this is inferred from the description and would typically require remote network access or a controlled environment where timing can be accurately captured. While the probability of successful exploitation is considered low, a successful attack could reveal protected data by reconstructing HMAC values."}}}}, "created": "2026-03-30T20:55:13.070614+00:00", "updated": "2026-04-03T09:38:08.846439+00:00", "vendors": ["nodejs", "nodejs$PRODUCT$nodejs"]}