Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-11850

Gravedad CVSS v3.1:
MEDIA
Tipo:
CWE-191 Subdesbordamiento de entero
Fecha de publicación:
11/06/2026
Última modificación:
12/06/2026

Descripción

*** Pendiente de traducción *** An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c. The function performs an unsigned subtraction (bv_len - 2) without a prior bounds check. When bv_len is 0 or 1, the subtraction wraps to a large value which is then truncated to uint16_t, yielding 0xFFFE (65534) or 0xFFFF (65535). The subsequent malloc succeeds and memcpy reads up to 65534 bytes from a 0-1 byte buffer, resulting in a heap out-of-bounds read.<br /> The attack vector involves a malicious or compromised LDAP KDB backend returning a krbExtraData attribute with bv_len