{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-18T16:55:09.059","vulnerabilities":[{"cve":{"id":"CVE-2026-27932","sourceIdentifier":"security-advisories@github.com","published":"2026-03-03T23:15:56.050","lastModified":"2026-03-05T18:00:44.620","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In 1.6.2 and earlier, a resource exhaustion vulnerability in joserfc allows an unauthenticated attacker to cause a Denial of Service (DoS) via CPU exhaustion. When the library decrypts a JSON Web Encryption (JWE) token using Password-Based Encryption (PBES2) algorithms, it reads the p2c (PBES2 Count) parameter directly from the token's protected header. This parameter defines the number of iterations for the PBKDF2 key derivation function. Because joserfc does not validate or bound this value, an attacker can specify an extremely large iteration count (e.g., 2^31 - 1), forcing the server to expend massive CPU resources processing a single token. This vulnerability exists at the JWA layer and impacts all high-level JWE and JWT decryption interfaces if PBES2 algorithms are allowed by the application's policy."},{"lang":"es","value":"joserfc es una librería de Python que proporciona una implementación de varios estándares JSON Object Signing and Encryption (JOSE). En 1.6.2 y versiones anteriores, una vulnerabilidad de agotamiento de recursos en joserfc permite a un atacante no autenticado causar una denegación de servicio (DoS) mediante el agotamiento de la CPU. Cuando la librería descifra un token JSON Web Encryption (JWE) utilizando algoritmos de cifrado basado en contraseña (PBES2), lee el parámetro p2c (PBES2 Count) directamente del encabezado protegido del token. Este parámetro define el número de iteraciones para la función de derivación de clave PBKDF2. Debido a que joserfc no valida ni limita este valor, un atacante puede especificar un número de iteraciones extremadamente grande (por ejemplo, 2^31 - 1), forzando al servidor a gastar recursos masivos de CPU al procesar un solo token. Esta vulnerabilidad existe en la capa JWA y afecta a todas las interfaces de descifrado JWE y JWT de alto nivel si los algoritmos PBES2 están permitidos por la política de la aplicación."}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","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":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-770"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:hsiaoming:joserfc:*:*:*:*:*:python:*:*","versionEndIncluding":"1.6.2","matchCriteriaId":"EC9EF694-A75A-4079-AAF2-1FBC961B94C0"}]}]}],"references":[{"url":"https://github.com/authlib/joserfc/commit/696a9611ab982c45ee2190ed79ca8e1d8e09398f","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/authlib/joserfc/security/advisories/GHSA-w5r5-m38g-f9f9","source":"security-advisories@github.com","tags":["Exploit","Mitigation","Vendor Advisory"]}]}}]}