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The issue is tracked upstream as [CVE-2026-23864](https://github.com/facebook/react/security/advisories/GHSA-83fc-fqcc-2hmg).\n\nA specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage, out-of-memory exceptions, or server crashes. This can result in denial of service in unpatched 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has a Denial of Service with Server Components\nA vulnerability affects certain React Server Components packages for versions 19.x and frameworks that use the affected packages, including Next.js 13.x, 14.x, 15.x, and 16.x using the App Router. The issue is tracked upstream as [CVE-2026-23869](https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg). You can read more about this advisory our [this changelog](https://vercel.com/changelog/summary-of-cve-2026-23869).\n\nA specially crafted HTTP request can be sent to any App Router Server Function endpoint that, when deserialized, may trigger excessive CPU usage. This can result in denial of service in unpatched environments.","references":[{"reference_url":"https://github.com/vercel/next.js","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/vercel/next.js"},{"reference_url":"https://github.com/vercel/next.js/security/advisories/GHSA-q4gf-8mx6-v5v3","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/vercel/next.js/security/advisories/GHSA-q4gf-8mx6-v5v3"},{"reference_url":"https://vercel.com/changelog/summary-of-cve-2026-23869","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://vercel.com/changelog/summary-of-cve-2026-23869"},{"reference_url":"https://github.com/advisories/GHSA-q4gf-8mx6-v5v3","reference_id":"GHSA-q4gf-8mx6-v5v3","reference_type":"","scores":[{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-q4gf-8mx6-v5v3"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/111513?format=json","purl":"pkg:npm/next@15.5.15","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/next@15.5.15"},{"url":"http://public2.vulnerablecode.io/api/packages/111514?format=json","purl":"pkg:npm/next@16.2.3","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/next@16.2.3"}],"aliases":["GHSA-q4gf-8mx6-v5v3"],"risk_score":4.0,"exploitability":"0.5","weighted_severity":"8.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-kxdb-aa4z-qqbu"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/49861?format=json","vulnerability_id":"VCID-vqxd-ebjg-c3cw","summary":"Next.js self-hosted applications vulnerable to DoS via Image Optimizer remotePatterns configuration\nA DoS vulnerability exists in self-hosted Next.js applications that have `remotePatterns` configured for the Image Optimizer. The image optimization endpoint (`/_next/image`) loads external images entirely into memory without enforcing a maximum size limit, allowing an attacker to cause out-of-memory conditions by requesting optimization of arbitrarily large images. This vulnerability requires that `remotePatterns` is configured to allow image optimization from external domains and that the attacker can serve or control a large image on an allowed domain.\n\nStrongly consider upgrading to 15.5.10 and 16.1.5 to reduce risk and prevent availability issues in Next applications.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-59471.json","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-59471.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-59471","reference_id":"","reference_type":"","scores":[{"value":"0.00041","scoring_system":"epss","scoring_elements":"0.12893","published_at":"2026-06-07T12:55:00Z"},{"value":"0.00041","scoring_system":"epss","scoring_elements":"0.12928","published_at":"2026-06-05T12:55:00Z"},{"value":"0.00041","scoring_system":"epss","scoring_elements":"0.12931","published_at":"2026-06-06T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-59471"},{"reference_url":"https://github.com/vercel/next.js","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/vercel/next.js"},{"reference_url":"https://github.com/vercel/next.js/commit/500ec83743639addceaede95e95913398975156c","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/vercel/next.js/commit/500ec83743639addceaede95e95913398975156c"},{"reference_url":"https://github.com/vercel/next.js/commit/e5b834d208fe0edf64aa26b5d76dcf6a176500ec","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/vercel/next.js/commit/e5b834d208fe0edf64aa26b5d76dcf6a176500ec"},{"reference_url":"https://github.com/vercel/next.js/releases/tag/v15.5.10","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/vercel/next.js/releases/tag/v15.5.10"},{"reference_url":"https://github.com/vercel/next.js/releases/tag/v16.1.5","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/vercel/next.js/releases/tag/v16.1.5"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2433094","reference_id":"2433094","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2433094"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2025-59471","reference_id":"CVE-2025-59471","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-59471"},{"reference_url":"https://github.com/advisories/GHSA-9g9p-9gw9-jx7f","reference_id":"GHSA-9g9p-9gw9-jx7f","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-9g9p-9gw9-jx7f"},{"reference_url":"https://github.com/vercel/next.js/security/advisories/GHSA-9g9p-9gw9-jx7f","reference_id":"GHSA-9g9p-9gw9-jx7f","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-27T14:54:47Z/"}],"url":"https://github.com/vercel/next.js/security/advisories/GHSA-9g9p-9gw9-jx7f"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/73639?format=json","purl":"pkg:npm/next@15.5.10","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-753e-dm2r-sybh"},{"vulnerability":"VCID-ffry-2c7p-vyhp"},{"vulnerability":"VCID-kxdb-aa4z-qqbu"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/next@15.5.10"},{"url":"http://public2.vulnerablecode.io/api/packages/73640?format=json","purl":"pkg:npm/next@16.1.5","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-2qqn-59dj-23e3"},{"vulnerability":"VCID-753e-dm2r-sybh"},{"vulnerability":"VCID-eqhy-dum5-yqef"},{"vulnerability":"VCID-ffry-2c7p-vyhp"},{"vulnerability":"VCID-kxdb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