CVE-2026-33846

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"https://bugzilla.redhat.com/show_bug.cgi?id=2450625", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33846.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-130"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-130"}]}], "descriptions": [{"lang": "en", "value": "A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in merge_handshake_packet() where incoming handshake fragments are matched and merged based solely on handshake type, without validating that the message_length field remains consistent across all fragments of the same logical message. An attacker can exploit this by sending crafted DTLS fragments with conflicting message_length values, causing the implementation to allocate a buffer based on a smaller initial fragment and subsequently write beyond its bounds using larger, inconsistent fragments. Because the merge operation does not enforce proper bounds checking against the allocated buffer size, this results in an out-of-bounds write on the heap. The vulnerability is remotely exploitable without authentication via the DTLS handshake path and can lead to application crashes or potential memory corruption."}, {"lang": "es", "value": "Una vulnerabilidad de desbordamiento de b\u00fafer de pila existe en la l\u00f3gica de reensamblaje de fragmentos de handshake DTLS de GnuTLS. El problema surge en merge_handshake_packet() donde los fragmentos de handshake entrantes se emparejan y fusionan bas\u00e1ndose \u00fanicamente en el tipo de handshake, sin validar que el campo message_length permanezca consistente en todos los fragmentos del mismo mensaje l\u00f3gico. Un atacante puede explotar esto enviando fragmentos DTLS manipulados con valores de message_length conflictivos, haciendo que la implementaci\u00f3n asigne un b\u00fafer basado en un fragmento inicial m\u00e1s peque\u00f1o y posteriormente escriba m\u00e1s all\u00e1 de sus l\u00edmites usando fragmentos m\u00e1s grandes e inconsistentes. Debido a que la operaci\u00f3n de fusi\u00f3n no aplica una verificaci\u00f3n de l\u00edmites adecuada contra el tama\u00f1o del b\u00fafer asignado, esto resulta en una escritura fuera de l\u00edmites en la pila. La vulnerabilidad es remotamente explotable sin autenticaci\u00f3n a trav\u00e9s de la ruta de handshake DTLS y puede llevar a ca\u00eddas de la aplicaci\u00f3n o potencial corrupci\u00f3n de memoria."}], "lastModified": "2026-10-26T19:10:00.163", "sourceIdentifier": "secalert@redhat.com"}