{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-17T07:44:43.990","vulnerabilities":[{"cve":{"id":"CVE-2026-1526","sourceIdentifier":"ce714d77-add3-4f53-aff5-83d477b104bb","published":"2026-03-12T21:16:23.933","lastModified":"2026-03-20T15:56:47.337","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a \"decompression bomb\") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive.\n\nThe vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold."},{"lang":"es","value":"El cliente WebSocket undici es vulnerable a un ataque de denegación de servicio a través de un consumo de memoria ilimitado durante la descompresión permessage-deflate. Cuando una conexión WebSocket negocia la extensión permessage-deflate, el cliente descomprime las tramas comprimidas entrantes sin imponer ningún límite en el tamaño de los datos descomprimidos. Un servidor WebSocket malicioso puede enviar una pequeña trama comprimida (una 'bomba de descompresión') que se expande a un tamaño extremadamente grande en memoria, causando que el proceso de Node.js agote la memoria disponible y colapse o deje de responder.\n\nLa vulnerabilidad existe en el método PerMessageDeflate.decompress(), que acumula todos los fragmentos descomprimidos en memoria y los concatena en un único Buffer sin verificar si el tamaño total excede un umbral seguro."}],"metrics":{"cvssMetricV31":[{"source":"ce714d77-add3-4f53-aff5-83d477b104bb","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"weaknesses":[{"source":"ce714d77-add3-4f53-aff5-83d477b104bb","type":"Secondary","description":[{"lang":"en","value":"CWE-409"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*","versionEndExcluding":"6.24.0","matchCriteriaId":"C08CE582-019D-4A06-910A-6010C2D6EF4F"},{"vulnerable":true,"criteria":"cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*","versionStartIncluding":"7.0.0","versionEndExcluding":"7.24.0","matchCriteriaId":"F016E7D9-C45A-4DEF-9AD8-F0581AF5E509"}]}]}],"references":[{"url":"https://cna.openjsf.org/security-advisories.html","source":"ce714d77-add3-4f53-aff5-83d477b104bb","tags":["Vendor Advisory"]},{"url":"https://datatracker.ietf.org/doc/html/rfc7692","source":"ce714d77-add3-4f53-aff5-83d477b104bb","tags":["Technical Description"]},{"url":"https://github.com/nodejs/undici/security/advisories/GHSA-vrm6-8vpv-qv8q","source":"ce714d77-add3-4f53-aff5-83d477b104bb","tags":["Vendor Advisory"]},{"url":"https://hackerone.com/reports/3481206","source":"ce714d77-add3-4f53-aff5-83d477b104bb","tags":["Permissions Required"]}]}}]}