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CVE-2026-33846

Full vulnerability record from the local CVENow database.

Description

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.

Severity
HIGH
CVSS score
7.5 (v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-05-04 10:15:59.690000
Last modified
2026-10-26 19:10:00.163000
View original CVE JSON
{
  "id": "CVE-2026-33846",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-04T10:15:59.690",
  "lastModified": "2026-10-26T19:10:00.163",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "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 búfer de pila existe en la lógica 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 basándose únicamente en el tipo de handshake, sin validar que el campo message_length permanezca consistente en todos los fragmentos del mismo mensaje lógico. Un atacante puede explotar esto enviando fragmentos DTLS manipulados con valores de message_length conflictivos, haciendo que la implementación asigne un búfer basado en un fragmento inicial más pequeño y posteriormente escriba más allá de sus límites usando fragmentos más grandes e inconsistentes. Debido a que la operación de fusión no aplica una verificación de límites adecuada contra el tamaño del búfer asignado, esto resulta en una escritura fuera de límites en la pila. La vulnerabilidad es remotamente explotable sin autenticación a través de la ruta de handshake DTLS y puede llevar a caídas de la aplicación o potencial corrupción de memoria."
    }
  ],
  "affected": [
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      "source": "[email protected]",
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