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reject negative UBJSON/BJData string length (#5284)

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This commit is contained in:
Angadi56
2026-07-21 02:02:38 +05:30
committed by GitHub
parent 1c5a953de5
commit 3565f40229
4 changed files with 92 additions and 8 deletions
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include/nlohmann/detail/input/binary_reader.hpp
+27 -4
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@@ -1846,6 +1846,29 @@ class binary_reader
return get_ubjson_value(get_char ? get_ignore_noop() : current);
}
/*!
@brief reject a negative UBJSON/BJData string length
String and key lengths are written with signed integer markers (i, I, l,
L). A negative value is malformed; without this check get_string() would
silently treat it as an empty string and leave the following bytes to be
misread as the next value. This mirrors the non-negative check the
optimized-container count path already performs in get_ubjson_size_value.
@param[in] len the string length read from the input
@return whether the length is valid (non-negative)
*/
template<typename NumberType>
bool check_ubjson_string_length(const NumberType len)
{
if (JSON_HEDLEY_UNLIKELY(len < 0))
{
return sax->parse_error(chars_read, get_token_string(), parse_error::create(113, chars_read,
exception_message(input_format, "string length must not be negative", "string"), nullptr));
}
return true;
}
/*!
@brief reads a UBJSON string
@@ -1883,25 +1906,25 @@ class binary_reader
case 'i':
{
std::int8_t len{};
return get_number(input_format, len) && get_string(input_format, len, result);
return get_number(input_format, len) && check_ubjson_string_length(len) && get_string(input_format, len, result);
}
case 'I':
{
std::int16_t len{};
return get_number(input_format, len) && get_string(input_format, len, result);
return get_number(input_format, len) && check_ubjson_string_length(len) && get_string(input_format, len, result);
}
case 'l':
{
std::int32_t len{};
return get_number(input_format, len) && get_string(input_format, len, result);
return get_number(input_format, len) && check_ubjson_string_length(len) && get_string(input_format, len, result);
}
case 'L':
{
std::int64_t len{};
return get_number(input_format, len) && get_string(input_format, len, result);
return get_number(input_format, len) && check_ubjson_string_length(len) && get_string(input_format, len, result);
}
case 'u':