{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-10-01T21:34:33.295","vulnerabilities":[{"cve":{"id":"CVE-2026-34876","sourceIdentifier":"cve@mitre.org","published":"2026-04-02T16:16:26.180","lastModified":"2026-07-24T21:10:00.143","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"An issue was discovered in Mbed TLS 3.x before 3.6.6. An out-of-bounds read vulnerability in mbedtls_ccm_finish() in library/ccm.c allows attackers to obtain adjacent CCM context data via invocation of the multipart CCM API with an oversized tag_len parameter. This is caused by missing validation of the tag_len parameter against the size of the internal 16-byte authentication buffer. The issue affects the public multipart CCM API in Mbed TLS 3.x, where mbedtls_ccm_finish() can be invoked directly by applications. In Mbed TLS 4.x versions prior to the fix, the same missing validation exists in the internal implementation; however, the function is not exposed as part of the public API. Exploitation requires application-level invocation of the multipart CCM API."},{"lang":"es","value":"Se descubrió un problema en Mbed TLS 3.x anterior a 3.6.6. Una vulnerabilidad de lectura fuera de límites en mbedtls_ccm_finish() en biblioteca/ccm.c permite a los atacantes obtener datos de contexto CCM adyacentes mediante la invocación de la API CCM multiparte con un parámetro tag_len de tamaño excesivo. Esto es causado por la falta de validación del parámetro tag_len contra el tamaño del búfer de autenticación interno de 16 bytes. El problema afecta a la API CCM multiparte pública en Mbed TLS 3.x, donde mbedtls_ccm_finish() puede ser invocado directamente por las aplicaciones. En las versiones de Mbed TLS 4.x anteriores a la corrección, la misma falta de validación existe en la implementación interna; sin embargo, la función no está expuesta como parte de la API pública. La explotación requiere la invocación a nivel de aplicación de la API CCM multiparte."}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-02T15:53:54.288854Z","id":"CVE-2026-34876","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","description":[{"lang":"en","value":"CWE-125"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*","versionStartIncluding":"3.1.0","versionEndExcluding":"3.6.6","matchCriteriaId":"556B943C-53E7-4B72-BFD9-086BD2384F5D"}]}]}],"references":[{"url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-ccm-finish-boundary-check/","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/","source":"cve@mitre.org","tags":["Vendor Advisory"]}]}}]}